PCV Valve Service At Downing Street Garage In Denver
Posted May 15, 2012 10:47 AM
The PCV Valve is a little, inexpensive part that does a big job for Denver drivers. PCV stands for Positive Crankcase Ventilation.
The crankcase is the bottom area of the engine that holds the oil. When the sedan engine’s running, fuel is burned to generate power. Most of the exhaust from combustion goes out through the exhaust system. But some exhaust blows by the pistons and goes into the lower engine, or crankcase.
These hot gases are about seventy percent unburned fuel. 
This can dilute and contaminate the oil, leading to damaging engine oil sludge. It can also cause sedan engine corrosion, something we see occasionally at Downing Street Garage. At high speeds on Denver freeways, the pressure can build up to the point that gaskets and seals start to leak.
Back in the old days, engine makers simply installed a hose that vented these gases out into the atmosphere. But starting in the 1964 model year, laws mandated that these gases be recycled back into the air intake system to be mixed with fuel and burned in the sedan's engine.
This is much better for the environment and it saves gas too. (Budget-conscious Denver drivers take note!) The little valve that controls all this action is the PCV valve. The PCV valve lets gases out of the engine, but won’t let anything back in. Over time, the vented gases will gum up the PCV valve and it won’t work well. That can lead to all of the problems I’ve already described, oil leaks, excessive oil consumption and wasted gas.
Fortunately, it’s very easy to test the PCV Valve at Downing Street Garage and quick and inexpensive to replace. Even so, it’s often overlooked because many Denver drivers don’t know about it. Check your sedan owner’s manual or ask your Downing Street Garage service advisor. If this is the first time you’ve heard of a PCV valve, you might be in line for a replacement.
There’s another aspect to the PCV system. In order for the valve to work correctly, it needs a little clean air to come in. This is done through a breather tube that gets some filtered air from the engine air filter. Now some vehicles have a small separate air filter for the breather tube called the breather element. That’ll need to be replaced at Downing Street Garage when it gets dirty.
Please ask your caring, ethical, efficient, trustworthy Denver service advisor about your PCV valve. For the price of a couple of burger combo meals in Denver, you can avoid some very expensive deep engine repairs.
Posted in the Parts category
Denver Alignment Service
Posted May 10, 2012 12:43 PM
Your car might have an alignment problem if: it drifts or pulls to one side, your steering wheel is off center, you have uneven tire wear or your car doesn’t feel like it handles right. When all of a vehicle’s wheels are lined up exactly with each other, your wheels are in alignment. Running into potholes, smacking a curb or other object are great ways to knock your car out of alignment. Then one or more of your wheels starts pulling in a slightly different direction and the problems begin.
Driving for an extended time when you're out of alignment causes your tires to wear unevenly and excessively. This can be dangerous and expensive. You'll have to replace your tires sooner, but even worse - you may cause premature wear to your suspension system, which can be really expensive.
The front wheel alignment is adjustable on all vehicles, and the back wheels are also adjustable on some cars. The adjustment can go three different ways. The first adjustment is called toe. The next adjustment is called camber. And finally, there is castor. The engineers who designed your vehicle determined the alignment settings that will give you the best handling and safety.
There are several things involved in an alignment check. First, there's an inspection of the steering and suspension - it should be checked to see if anything's bent or broken. Then the tire condition needs to be inspected. From there, the vehicle is put on an alignment rack and an initial alignment reading is taken. If all four wheels are adjustable, they are lined up perfectly parallel with the vehicle's center line. If the back wheels aren't adjustable, a technician at Downing Street Garage can determine the direction they push and then aligns the front wheels to match.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Like most things, your manufacturer has suggested a mileage interval for having your alignment checked. But if you run into a curb, pothole or something else that's given you a big jolt, pay attention to whether your vehicle is pulling to one side when you drive. It's better to have your alignment checked before waiting to see if there is uneven tire tread wear - by then, the damage is done.
Getting your alignment checked when needed is a great way to extend the life of your tires and suspension parts. It also makes sure that your tire meets the road properly for maximum performance and safety.
Posted in the Alignment category
Nitrogen Fill For Tires in Denver Colorado
Posted May 1, 2012 12:33 PM
So, everyone in the Denver Colorado area knows how great helium is – you know, party balloons, squeaky voices. But a lot of people around Denver still haven't heard about the benefits of nitrogen in your tires, and how it can help your tires. Here's some great advice from AutoNetTV, brought to you by Downing Street Garage.
Nitrogen has actually been around for a long time in the Denver Colorado commercial sector, but it's just starting to catch on for private vehicles in the 80218 zip code area.
Why nitrogen in your tires? Air is air, right? Actually, it turns out there is a difference.
Contact Downing Street Garage to learn more about nitrogen in your tires
You can find us at:
401 Downing Street
Denver, Colorado 80218
Or call us at 303.777.0142
The heart of the matter is maintaining proper tire inflation. When your tires are properly inflated, they last longer, handle better and more safely, and save you money at the gas pump.
The problem is that tires filled in Denver with regular air can lose a pound and a half of air pressure every month. This just happens as the oxygen in the tire seeps out. So if you don't check your pressure for a month or two, well, you can be significantly low – low enough to actually affect your handling, shorten tire life and waste money at the fuel pump.
How does nitrogen help? Regular air contains about 78% nitrogen. Nitrogen is the largest molecule in air. It's dry and non-flammable. Air also contains 21% oxygen, which is smaller and seeps out of the tire three to four times faster than nitrogen.
So, a tire filled with nitrogen at Downing Street Garage will take about six months to lose as much pressure as regular air does in just one month. So it's more forgiving for those who don't check their pressure every week.
Also, when oxygen is at higher temperatures – like those inside your tire when you've been driving for awhile – it oxidizes the inside of your tire. Getting the oxygen out of your tire means that it'll last longer.
Who's using nitrogen? Well, let's start with NASCAR and Indy. These racers like nitrogen's ability to maintain consistent tire pressure and reduce tire temperatures under very demanding conditions. The US government requires all commercial aircraft to have nitrogen in their tires. NASA and the US Military use nitrogen. The mining industry has been filling those "humongous" tires with nitrogen for years. And semi trucks and trailers are starting to use nitrogen extensively.
You may have heard some detractors of nitrogen. But the studies and white papers from tire and vehicle manufacturers demonstrate that the technology really works.
In fact, a prominent consumer research group did a study where they filled some tires with air and some with nitrogen and stacked them outside for a year. They observed that the nitrogen filled tires did hold their pressure better, but they couldn't see the economic benefit. But that particular test has very little to do with the real world. Most tires are actually holding up cars and they also get driven around and do a lot of work. So if nitrogen helps them last longer, saves gas and gives safer handling, it's worth considering.
Learn more about nitrogen in your tires by watching our attached auto tips video from AutoNetTV.
Posted in the Tires and Wheels category
Handling Distractions While Driving Around Denver
Posted April 24, 2012 1:48 PM
We've all seen people do crazy things while driving to or from Denver. A guy shaving in the rear-view mirror, a woman applying makeup, people talking on their phones, texting or drinking from an enormous coffee mug. All of these are an accident waiting to happen.
The truth is everyone in Denver Colorado is distracted when we drive. Traffic, road construction and other things outside the car are beyond our control. But the distractions inside our car are things we can often control.
Here's some things that'll give you more control in your car, and help keep your attention on the roads around Denver Colorado.
- Drivers who are 16 to 20 years old tend to be more distracted by the radio, CD or MP3 player.
- Drivers who are 20 to 29 are more distracted by passengers in the car, including small children.
- And those over age 65 tend to be more distracted by objects or events that are outside of the vehicle.
Other factors like fatigue, stress and lack of sleep make it harder to pay attention to driving – no matter what age we are. People are also distracted by thinking about relationships, family issues, money and bills. So what can we do to manage these distractions? Well, the first thing is to eliminate as many as we can.
When you get in your car, make sure you're belted in; that the seats, steering wheel and mirrors are adjusted; and your radio or CD player is ready.
Secure any loose objects in the car that can fall on the floor and interfere with your driving.
If you have a drink, make sure it's spill-proof and put in a cup holder. Pets should also be contained.
If you're riding with kids, make sure they're wearing seat belts or secured in safety seats. You may want to give em some distractions to keep them quiet and sitting in their seats. Don't get involved in their arguments while you're driving. Pull over if you need to find a toy or break up a fight.
If you eat while driving, keep it to simple finger foods that aren't messy.
Learning your car's controls before you drive is another way to improve your safety. Know how to work the radio by touch. The same goes for heating and air conditioning controls.
If you have to use a cell phone, a hands-free system is best. But remember, the biggest cell phone distraction isn't the phone itself – it's the conversation. Keep conversations brief and light, or pull over if you can. Your reaction time is much slower when talking and driving, so allow more space between you and the car ahead of you. Know your local laws – it may be illegal to be on the phone or text in the Denver Colorado area.
And if you really think you have to shave, change your clothes or put on make-up while driving – you're wrong. Just start getting ready earlier so you have enough time to finish those things before you drive into Denver Colorado.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Remember, driving is probably the most dangerous thing you'll do all day – so don't make it any worse. Use these tips to keep you and your loved ones safer behind the wheel.
Posted in the Service Standards category
Fall and Spring Checkup In Denver
Posted April 18, 2012 9:51 AM
When I was a kid in Denver, my dad always made sure he took the cars in for Spring and Fall checkups. I was telling a friend that it's about time to get into Downing Street Garage for my checkup and he said that he read on the internet that modern cars don't need seasonal service.
My friend is (technically) right about some things, but from a practical standpoint, a seasonal check up still makes sense.
Back when my dad was teaching me about how to take care of the family sedan, most cars used a different weight of oil in the winter and in the summer. But most of today's modern engines run the same oil year round. High-tech engines and high-tech motor oils are better able to handle the seasonal changes.
Your owner's manual or Denver service advisor at Downing Street Garage can tell you the right oil to use.
Of course, you're concerned about the coolant or antifreeze. You don't want to overheat in the Colorado summer or freeze up in the winter. Your engine cooling system protects against both of these things. And modern coolant, or as it's sometimes called; 'antifreeze', is up to doing both very well. It's designed to last for more miles than most people drive in a year or two.
So how does a Spring and Fall check-up fit in? Let's start with Spring. Summer is coming. That means heat, more miles driven and road trips. It just makes sense to check your fluid levels and do a visual inspection to see that everything is up to snuff.
You may not be scheduled to drain and replace the coolant for some time, but you need to make sure you have enough coolant, and that you don't have any leaks or hoses that are about to fail.
That's pretty practical; a check-up to see if there are any problems or emerging conditions that could later become a problem, like a cracked belt.
And the same principle applies for getting ready for winter. Cold weather means lots of failed batteries. It takes more power to crank up a cold engine, and cold also decreases the available cranking power the battery has available.
So a battery test in the Fall could tell you if you've got a battery that is running on its last legs. And of course, if you live where winter temperatures get below 45 degrees or you have ice and snow, you'll want to consider changing to winter tires.
So Spring and Fall auto checkups at Downing Street Garage are practical reminders to get ready for the demands of the hot and cold seasons to come.
And odds are that you have one or more routine services that are due anyway. Like a transmission service, brake or power steering fluid, differential service – stuff like that. Are your wiper blades still good? Are your headlamps starting to dim?
So Spring and Fall: change your clocks, replace the batteries in your smoke detectors – and get a check-up for your cars.
See, dad was right again.
Come and see us at Downing Street Garage for your Spring and Fall automotive checkup.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Posted in the Maintenance category
Downing Street Garage On Your Serpentine Belt
Posted April 11, 2012 2:33 PM
Today we’re going to be talking about serpentine belts for our Denver Colorado customers. Let’s start by talking about the accessories that are driven by the serpentine belt. First is the alternator. That’s the device that makes electricity to power the vehicle and recharge the battery. Then there’s the air conditioning compressor that makes cool air for you while you're driving around Denver Colorado in the summer.
The power steering and power brake pumps are driven by the serpentine belt in most vehicles. Those pumps make the pressure that assists your steering and braking.
In many vehicles, the water pump is driven by the serpentine belt. The water pump is what circulates the coolant that protects your engine. In some cars around Denver Colorado, the water pump is driven by the timing belt.
The radiator cooling fans on some vehicles are also driven by the serpentine belt. Some have separate electric motors. That’s really a lot of work for one belt.
But modern engine design has a single belt that snakes around the front of the engine and drives most if not all of these accessories. Serpentine belts do a lot of work, but they’re tough and can last for thousands of miles.
Just how long will they last? That’ll vary for each individual car in the Denver Colorado area. Your manufacturer will have a recommendation for when it should be changed, but it could need it sooner. The good news is that a visual inspection can reveal a belt that’s getting close to failing.
Downing Street Garage can look at the belt: if it has more than three or four cracks per inch it needs to be replaced. A deep crack that’s more than half the depth of the belt - replace. Frayed, missing pieces, a shiny glazed look? It’s out of there.
What’s involved in replacing the belt? First the old belt is removed. Then a new one is fitted around all the pulleys for the accessories and the drive. There’s a special pulley called a tensioner.
This pulley is mounted to the engine block with a spring loaded arm. Its job is to apply the correct amount of tension to the belt to keep it from getting loose and maybe slipping off. Because the spring in the tensioner pulley wears out, AutoNetTV recommends replacing them at the same time as the belt. It just makes sense.
What are the warning signs that there’s a problem with the serpentine belt? You may hear a squealing sound from under the hood when accelerating around our Denver Colorado streets. A loose belt might give you a slow, slapping sound.
What do you do if your belt breaks? If you’ve actually had that happen on our local Denver Colorado freeway, it can be a little scary. Often the first thing you notice is that you have no power steering or power brakes. Don’t panic – you can still steer and brake, but you’ll have to do the work. It’ll be harder to steer and you’ll need more time and effort to stop, so plan accordingly.
Your dashboard will light up will all kinds of warnings. You’ll see a warning about your cooling system if you have a water pump that’s driven by the serpentine belt. This is very critical because without your cooling system working, your engine will overheat. If you don’t stop you’ll have massive engine damage, maybe to the point that you need a new engine. Pull over as quickly as you safely can. Open your windows and turn the heater on full blast to provide a little engine cooling and pulled over as soon as possible.
The battery light will come on because the alternator isn’t working. If your car’s water pump isn’t driven by the serpentine belt, you’re not in danger of overheating so you can drive a little further if necessary. But the battery will run down to the point where the car won’t run and will just shut off. You don’t want that to happen while you’re driving in our local Denver Colorado traffic.
Remember, this does not have to happen if you replace your serpentine belt on schedule. Ask your technician at Downing Street Garage to check your belts and hoses from time to time so you can take care of them if they need to be replaced prematurely.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Posted in the Maintenance category
Defensive Driving In Denver Colorado
Posted April 5, 2012 1:59 PM
There was a man in Denver who learned that most car accidents occur within a mile of home – so he moved. (Just Kidding!)
When we think of defensive driving, we often focus on our local Colorado highway situations. The fact of the matter is we need to be just as careful close to home in Denver, because that's where we do most of our driving. We can't let our familiar surroundings keep us from driving defensively.
Defensive driving begins with the proper attitude. Have in mind that you won't let anyone take your safety away from you. You'll be aware of your surroundings, road conditions, other vehicles and hazards. And the first person to be concerned with is you: start with your own environment.
Don't leave without securing all occupants including children and pets. Watch for loose items that can become projectiles during evasive maneuvers.
Driving too fast or too slow increases the chance of an accident.
Never drive impaired: Alcohol is a factor in half of all fatal crashes. Never drink and drive.
Other impairments include being sleepy, angry, daydreaming or talking. If you suddenly wonder how you got where you are – you're not paying enough attention.
Keep your windows clean and uncluttered. No fuzzy dice and stickers.
Keep your car in good shape so that it handles properly: Maintain tires, lights, brakes, suspension, wheel alignment and steering.
Always use your turn signals while driving around Denver Colorado. Avoid other vehicles' blind spots.
Don't drive faster than your headlights – if you can't stop within the distance you can see, you're going too fast.
Avoid driving over debris in the road. Even harmless looking items can cause damage or an accident.
Keep your wheels straight when waiting to turn at an Denver Colorado intersection. That way if you're hit from behind, your car won't be pushed into on-coming traffic.
My daddy always said that when you drive, you're actually driving five cars: yours, the one in front, the one behind and the ones on either side. You can't trust that other drivers will do the right thing, so you've got to be aware of what they're doing at all times.
If you see another car driving erratically, weaving, crossing lanes, etc., stay back. Take the next right turn if you're downtown Denver, or take the next exit on the Colorado highway. Notify the police if you see someone driving dangerously in our Denver community.
Never follow too close. The minimum distance is the two second rule. Pick a landmark ahead, like a tree or road marker. When the car in front of you passes it, start counting: 'one-one-thousand, two-one-thousand'. If you pass the landmark before reaching two-one-thousand, you're following too close.
Remember that the two second rule is the minimum – it assumes you're alert and aware. Three seconds is safer. Move out to five seconds or more if it's foggy or rainy.
Someone will inevitably move into your forward safety zone – just drop back and keep a safe distance.
If someone follows you too closely, just move over.
Don't play chicken by contesting your right of way or race to beat someone to a merge. Whoever loses that contest has the potential to lose big and you don't want any part of that. So stay alert, constantly scan around your car and arrive safely.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Posted in the Steering category
Tire Maintenance In Capital Hill
Posted March 29, 2012 10:49 AM
With the recent focus in Capital Hill on improving fuel economy, we've been told how important it is to maintain our tire pressure.
Everyone in Capital Hill knows that tires wear out, but we all want to make them last as long as possible because they're fairly expensive to replace. In addition to saving gas, properly inflated tires last longer. Under-inflated tires will wear out more quickly.
Some people in Capital Hill wonder if there is benefit to adding a few extra pounds of pressure when they fill up their tires. But actually, there isn't. In fact, there are very good reasons not to over-inflate your tires. For one, the middle of the tread will wear unevenly because the full tread is not contacting the road properly. That also adversely affects your handling.
Come in and see us about tire maintenance for your Denver, Colorado vehicle.
Downing Street Garage
401 Downing Street
Denver, Colorado 80218
303.777.0142
Every vehicle in the Capital Hill area has a sticker on the driver's side door jamb that tells you the manufacturer's recommended tire pressure. This recommendation is an integral part of the vehicle's suspension tuning. A lot of engineering actually goes into the recommended tire pressure, so it's important to follow it.
What else do we need to know about tire maintenance? Tire rotation and balancing are very important. Let's start with rotation. Because the front tires handle the brunt of turning forces, the shoulders of the front tires wear more quickly than the rear tires. We rotate the tires so that they all get to do some duty on the front and they'll all wear evenly over their life.
For most vehicles, front tires are rotated to the rear and vice versa. Others recommend a cross rotational pattern. Some vehicles use an asymmetrical tire so those tires need to stay on either the right or left side – it'll say which on the tire. Some high performance cars have asymmetrical tires and different sizes on the front and rear. These can't be rotated at all. Your owner's manual will have details for your car.
How often should you rotate your tires? Your owner's manual will have a recommendation. Your service advisor at Downing Street Garage can do a visual inspection to let you know if it looks like it should be done. The interval is typically around 5,000 miles.
You know, some people don't think new tires need to be balanced. What they aren't taking into account is the wheel. Between the wheel and the tire – even a new tire – there's enough variation to require balancing.
When you add the valve stem and tire pressure monitoring sensors required on new cars, balancing is definitely in order. When a tire's out of balance, it's actually hopping down the road. You'll feel the vibration through the steering wheel if a front tire's out of balance and through your seat if it's a rear tire.
Proper wheel balance promotes tire life and increases safety. Historically, lead weights have been attached to the wheel to bring it into balance. Lead gives some environmental concern, so steel weights are starting to be substituted.
Also, always use the same size tire on an axle. Different size tires on the front or on the back can lead to some real handling problems. And tire manufacturers recommend that when you get two new tires, they be installed on the rear because that's where you need the most traction to avoid spinning-out.
Posted in the Tires and Wheels category
How to Know When to Change Your Oil At Downing Street Garage
Posted March 23, 2012 11:45 AM
Today in the Downing Street Garage auto care blog, we’re going to talk about oil change intervals. It seems that as engine technology advances, recommended oil change intervals have gotten longer for Downing Street Garage customers. High quality oil in a well-engineered sedan engine has lead to extended intervals. But it’s also lead to some confusion among Denver drivers.
The old mantra “change your oil every three months or three thousand miles, whichever comes first” once applied to every vehicle in your garage. Time and miles take their toll on motor oil. But now, you could have a different oil change recommendation for every car or truck you own.
Denver people are like everybody else, they have a tendency to put off all the oil changes to the schedule of the vehicle with the longest interval. Of course, that can lead to problems. 
For example, recently four of the world’s largest auto manufacturers shortened the published intervals for several of their engines. They originally published intervals that extended out to a much as 8,000 miles.
In real world Denver driving, the oil started to sludge up before the recommended change interval. Oil sludge is a thick jelly-like substance. Quite literally petroleum jelly – like Vaseline. This goop was clogging sedan small engine passages so the oil wouldn’t flow to some parts of the engine. This resulted in engine damage. We see it from time to time at Downing Street Garage.
The manufacturers began to offer an extended warranty to cover sludge damage. But there was a catch: the vehicle owner had to follow a new, lower service interval, and provide proof of oil changes in order to make a warranty claim.
So here’s the problem. With longer oil change intervals, it’s extremely important to follow them closely. Back in the day of 3 months or 3,000 miles, if you went an extra month or an extra thousand miles, your oil was still fresh enough that it didn’t have time to build up much sludge.
But if your recommended interval is 6,500 miles and you go over another thousand, you’re getting into heavy sludge territory. You absolutely need to follow mileage intervals very closely. And don’t forget your severe service schedule. If you do a lot of stop and go driving in Colorado, short trips, drive in dusty or polluted Denver conditions, hot or cold weather, or haul heavy loads, you’re driving in severe service conditions. Your Downing Street Garage advisor can help you evaluate which schedule to follow.
So check your sedan owner’s manual or talk with your Denver service advisor about where and how you drive. Should you be changing your oil closer to the regular schedule, or the severe service schedule? You need to make the call.
Let me give you an example of this. Some newer sedans have an oil change indicator. It has a sophisticated computer algorithm that tracks number of cold starts, engine temperature, RPMs, mileage, and many more variables to come up with a recommendation for when to change the oil.
Depending on driving conditions, the indicator in one test vehicle came on at anywhere from 2,500 miles to almost 7,000 miles. It’s typically just over 4,000 miles. What this tells us is that sometimes, we’re driving easy miles that are easy on the sedan – like a long road trip. Sometimes, we’re driving hard Colorado miles – like towing a trailer or a lot of around town driving. But, usually, it’s a combination of both.
Once again, it’s up to you to make the call as to when to change your oil at Downing Street Garage to protect your sedan engine. Another place where Colorado drivers can go wrong is with the type of oil they use. More and more new cars are coming to Denver owners filled with synthetic oil. Without going into a lot of detail right now, let’s just say that synthetic oil lasts longer and is very resistant to oil sludge.
But it also costs quite a bit more, so some Denver people are tempted to use conventional oil for their oil changes. Now, it’s always best to use the oil recommended by your manufacturer. Check your owner’s manual see if a conventional oil alternative is allowed.
But getting back to the problem, if your sedan came from the factory with synthetic oil, the recommended oil change interval is for synthetic oil. If you use conventional oil, you can’t use the synthetic interval. You need to shorten it.
Posted in the Fluids category
Cooling System Components
Posted March 15, 2012 10:32 AM
Today we want to talk about a very important system in our cars – the cooling system. It’s one of those things that you don’t give much thought to until it fails and then you’re stranded by the side of the road.
Cooling systems fail more often than any other mechanical system – usually because of neglect. Don’t you hate it when something breaks, and you could have done something to prevent it?
The good news is that if you take care of your cooling system it can keep working for the life of your car.
Here at AutoNetTV, we emphasize preventive maintenance services like replacing your coolant according to the factory schedule. But the various parts that make up the cooling system need attention too. The major components of the cooling system are the water pump, freeze plugs, the thermostat, the radiator, cooling fans, the heater core, the pressure cap, the overflow tank and the hoses.
It sounds complicated, but we don’t have to be experts – we can leave that to our caring, ethical, efficient, trustworthy service technicians at Downing Street Garage. But, having an overview will help us remember to take care of our cooling systems.
Most people would be surprised to know that burning fuel in your engine produces up to 4,500 degrees of heat. And all that heat has to be dealt with. If the heat can’t be drawn off the engine, the pistons will literally weld themselves to the inside of the cylinders – then you just have to throw the engine away and get a new one. That would cost thousands of dollars.
Now the water pump is what forces the coolant through passages in the engine to absorb heat. The pump is driven by a belt that needs replacement from time to time. And the water pump will eventually wear out and need to be replaced. Spending some money on replacing the belts and water pump is much less than the cost of repairing the massive damage that can be done when an engine seizes.
There’s another little part of the coolant system that protects the engine. It’s called a freeze plug. If you remember from high school chemistry, water expands when it freezes. In very cold areas, the coolant can actually freeze when the vehicle is left sitting.
It is hard to believe, but the expanding frozen coolant can actually crack the engine block. The freeze plugs fit into the engine block. They fit tight enough to withstand the pressure of a running engine, but can expand or pop out if the coolant freezes. These little things save a lot of engine blocks.
That brings up a good point. An engine has to work in all kinds of temperatures – extremely hot as well as very cold. How does the cooling system adapt to external temperatures as well as varying operating conditions?
Well, it’s much like the way you keep your house at a comfortable temperature all year round – with a thermostat. The thermostat in your car controls how much coolant flows through your engine. When the engine is cold, it restricts coolant flow until the engine comes up to an efficient operating temperature. Then it starts opening up to move more coolant to keep the temperature within a specified range.
The thermostat needs to be replaced from time to time as well. It’s easy to diagnose a failed thermostat and is fairly inexpensive to replace. We can do this for you at Downing Street Garage in Denver, just give us a call: 303.777.0142. Now we’ve been talking about all this heat we’ve got to get rid of, but haven’t really talked about where it goes. That’s where the radiator comes in. The hot coolant passes through the radiator. Air flows past the cooling fins and cools the coolant.
The radiator has two tanks that hold coolant: sometimes one the top and bottom or one on either side. If you have an automatic transmission, one of the tanks will also contain a second tank that cools the transmission fluid. Large SUV’s and trucks often have a separate transmission cooler. So when you drive around Denver, the air is forced past the radiator. But driving doesn’t produce enough air flow. So the radiator has cooling fans that force fresh air over the radiator. These fans may be powered by a belt or by electric motors.
Now, you also have something called a heater core. The heater core is like a mini radiator. A small fan blows air over the heater core and into the passenger compartment of your vehicle. That’s how you warm your car when it’s cold out.
Next is the radiator cap. With most newer cars around Denver, you never remove the radiator cap, except to replace it. You add coolant through the overflow tank. The radiator cap is also called a pressure cap, because its job is to maintain pressure in the cooling system.
High pressure raises the boiling point of the coolant, so it cools more effectively even in very demanding conditions. That is why you need to replace the cap from time to time. They recommend changing it out every time you replace your coolant.
Coming back to the overflow tank, it is needed because when the coolant gets hot it expands and the overflow holds the extra volume. The tank helps maintain the proper level of coolant and keeps air out of the system. You should never open the radiator cap or over flow tank when the engine is hot. This could lead to serious burns.
What else do we need to do to keep our cooling systems working well? Well, there are the hoses that hook all of these pieces together. They’re obviously very tough to deal with the pressure and high temperatures. But they do get worn. Sometimes they get spongy from the heat. Sometimes they lose their connection to the radiator, water pump, etc. It’s a great idea to have your Denver service center inspect your hoses at least once a year and replace them, if needed, before they break.
Downing Street Garage can help you check your cooling system and make any necessary adjustments or repairs. Give us a call at 303.777.0142.
Posted in the Cooling System category
