Express Car Care of Denver

"Denver's Best Auto Repair and Quick Lube"

Axles

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AxlesQuestion:
I hear a clunking sound from my front wheel when I make a turn.  What could be the problem?

Express Car Care Answer:  One possible cause of the problem is a worn axle.  Front-wheel drive vehicles have axles that transfer power from the transmission to your front wheels.  There is one for each front wheel.  These axles are called constant velocity axles or CV axles for short.  Rear-wheel drive vehicles have axles that are in back and run between the differential and the rear wheels.  Then there are all-wheel drive vehicles which have an axle at each wheel.

When a front CV axle goes bad, it will make a clunking noise as you make a slow turn.  When a rear axle goes bad, the clunking or moaning sound will be in the back.  No, there really isn’t any preventative maintenance you can have performed to make your axles last longer, but you can have them inspected from time to time to see if a problem such as a leaking seal or torn protective boot has arisen.  Sometimes finding the problem early will make the repair easier and less costly.

Of course, axles do wear out and need to be replaced.  This is dangerous and should not be put off by drivers, because a severely worn axle can seize up causing damage to your transmission or other components.  This could even lead to an accident for any driver who ignores a worn axle.

If you suspect an axle problem, have it looked at right away.  Ask your friendly and knowledgeable service adviser at Express Car Care if it’s time for your axle to be replaced.

Ball Joints

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Most drivers in Denver know that ball joints are an important part of the suspension system.  Visualize a ball attached to a spindle, with the ball enclosed in a cup.  This allows the joint to move in several directions, kind of like the way your hip works.

Most vehicles have two or four ball joints on the front, depending on the type of suspension system.  The joint allows the wheels to move up and down as the tires go over bumps, as well as allowing the wheels to turn as you steer.  The ball joints are continuously working and are subject to normal wear.  Most ball joints on modern vehicles are maintenance free, meaning they are sealed and cannot be lubricated.  Once the lubricant breaks down or leaks out due to a broken seal, the ball joint will wear more quickly.  Ball Joints

You may hear a clicking or popping sound from a corner of the vehicle when turning and /or going over bumps as a ball joint is failing.  Your steering may begin to feel sloppy or stiff, depending on how the joint is wearing.  You may even feel vibration in the steering wheel at highway speeds.  Unusual tire wear is also a sign of a problem.

It’s important to replace worn ball joints BEFORE they fail.  Once it fails, the joint may not be able to constrain the steering angle of a wheel, causing you to lose control.

Your owner’s manual calls for periodic suspension system inspections.  The ball joints are an important component that will be inspected for safe function.  We can check to see if you are due for a suspension system inspection or ask you service adviser for an inspection if you are experiencing any of the signs of ball joint wear.

 

Tracking True

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Tracking TrueWheel alignment is often overlooked by busy car owners until serious tire damage has been done.  One wheel can be knocked out of alignment from the others by hitting a curb or a pothole in the road.

The tires will wear out very quickly and will need to be replaced prematurely.  It could also lead to suspension damage.  Conversely, worn suspension or steering components can lead to alignment problems for motorists.

But the big issue for drivers is safety.  When your wheels are out of alignment, the vehicle will pull to one side, which could lead to an accident.  When you’re out of alignment, you should have it taken care of right away.

Signs of alignment problems are:  Your car pulls to one side.  Also, your steering wheel may not be centered when you’re going straight.  If you see the edges of one or more tires rapidly wearing down, your should have your service adviser look it over.

If you’ve been in an accident that involved a wheel, you should get your alignment checked.  A big jolt can seriously throw things out of alignment, but drivers also need to understand that a series of smaller ones can add up.  Worn steering or suspension components can also lead to alignment problems for drivers.  That’s why your vehicle manufacturer recommends periodic alignment checks.

If your owner’s manual doesn’t specify, once a year might be appropriate, or check with your service adviser.  He’ll be able to tell you if your vehicle requires a four wheel alignment or if it’s just the front wheels that can be aligned.

One thing is for sure, the cost of an alignment is cheaper than having to buy new tires because of neglect.

 

Thermostat

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ThermostatThe thermostat on your vehicle is an important part of your cooling system.  Your thermostat performs a similar function to the thermostat in your home.  At home, you set your thermostat to maintain a comfortable temperature range.  When your home gets too hot, the air conditioning kicks on and when it gets too cool, then the heater.

Now your engine also has an optimal temperature range:  warm enough to run efficiently, and not so hot as to cause engine damage.  Your vehicle’s thermostat is a valve between the engine and the radiator.  When you first start a cold engine, the valve (thermostat) is closed, allowing the coolant surrounding the engine to warm up to the proper operating temperature.  As the coolant gets hotter, the thermostat opens, allowing coolant to flow through to the radiator to be cooled.  The thermostat opens and closes to keep the engine within a certain temperature range.

Now thermostats are rated for a specific temperature depending on the engine – not a one size fits all proposition.  Thermostats are subject to normal wear.  Proper operation depends on a special wax that expands as it heats up, to open a spring-loaded valve.  A worn thermostat could stick in the open position causing the engine to run too cool.  This is inefficient and could hurt performance and fuel economy.  If a thermostat sticks in the closed position, the engine can quickly overheat, possibly causing damage.

There isn’t a specific maintenance routine for the thermostat, but maintaining your cooling system by changing your coolant/antifreeze on schedule will make sure the coolant has enough corrosion inhibitors to protect the thermostat and other vital system components.  Cooling system experts recommend replacing your thermostat when you do a coolant flush or exchange.  Also, thermostats usually wear out faster than your hoses, so if you need to replace worn hoses, replace the thermostat at the same time.

If your temperature warning light comes on, have your cooling system inspected right away.  This could be a thermostat problem.  The thermostat could also be the culprit if you aren’t getting hot air when you turn on your heater.

The thermostat is a relatively inexpensive part that stands guard between you and catastrophic engine damage.  Follow your owner’s manual instructions, or check with your service adviser to see if it’s time for a cooling system inspection or service.

Service Intervals

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Service IntervalsQuestion:
I’m really confused about auto service intervals for various items on my car.  Help!

Express Car Care Answer:  The simple answer for Denver drivers is to follow the vehicle’s recommended service intervals listed in your owner’s manual or in your service center’s database.  But the team at Express Car Care sympathizes with you because of the confusing intervals for modern vehicles.

The days of simple rules of thumb that applied to most vehicles are long gone.  For example, let’s look at an oil change:  manufacturers’ recommendations run anywhere from every 3,000 miles to 15,000 miles.  This big range comes from engine design and recommended types of oil – so drivers really do need to know and follow the recommendations for their specific vehicle.

Your owner’s service manual will have a schedule for both maintenance services and inspections.

Service items include:  Tire rotation, wheel balancing, oil change, coolant service, transmission service, brake system, power steering system, fuel system, differential service, and transfer case service.

Inspections will include:  Alignment check, air conditioning, brakes, suspension, axles, exhaust, tires, lights, emissions, belts and hoses, and steering.

It’s important to remember there is NO exception that would make it OK to extend an interval.  These intervals already assume the “best case” conditions for a safe margin of error.  However, you may live or drive in conditions that are harsher than average.  Your owner’s manual may have a modified schedule for “severe service” – things like extreme temperatures, towing, hauling heavy loads, short trips, or stop-and-go traffic.

Consult your owner’s manual or with your service adviser about your driving situation and adjust your service intervals accordingly.

 

Viva la Differential

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Viva la DifferentialWith front-wheel drive being so common these days, the differential is also being taken care of during a transmission service at Express Car Care, so most Denver drivers don’t even have to think about it.  And most rear-wheel drive differentials don’t need to be serviced for many miles, so it’s understandable why it’s not something on the top of drivers minds.  Because of this, it’s not uncommon for people not to know they have a differential, let alone know that it needs service.

To understand better what a differential does, think about a high school track.  There are lanes marked on the track.  For the long distance races, the starting lines are staggered.  The starting lines for the outside lanes are ahead of the starting lines for the inside lanes.  That’s to compensate for the longer length of the outside lanes.  Staggering the starting lines means that each runner has the same distance to run.

The differential compensates for the difference in speeds on drive wheels between the inside wheel and the outside wheel in a turn because they have to travel together through slightly different distances.

Differentials do a lot of work and require very heavy duty parts, and those parts need protection.  The differential fluid lubricates the gears in the differential and keeps them cool.  The fluid eventually gets dirty and worn down.  Some kinds of differentials require special additives that break down over time.  So follow recommended intervals for replacing your differential fluid.

Your helpful and knowledgeable pro at Express Car Care will drain the used fluid and check it out for metal bits, which could be a sign of excessive wear on the gears.  He’ll then replace the fluid and install the additives if necessary.

Four wheel drive vehicles need special attention to their differentials because they have a differential on both the front and rear axles that work at different times and sometimes under heavy loads – so they may need to be serviced at different intervals.  Your service adviser can look up the recommended service interval or you can check your owner’s manual.

 

Wheel Bearings

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Wheel BearingsYour wheel bearings may be something that you’ve not given much thought about while you’re driving your car around.  But wheel bearings are what enable your wheels to spin freely.  Since they bear the entire weight of the vehicle, they have to be tough.  Wheel bearings can last well over 60,000 miles or 100,000 kilometers.  They do wear out though and must eventually be replaced.

You might hear a groaning sound from your wheels.  The sound might disappear at some speeds and reappear at others.  Your service technician at Express Car Care can quickly tell if your bearings are bad by raising the vehicle and wiggling the wheel.  When you grasp the top and bottom of the tire, it shouldn’t move along the vertical axis.

Many vehicles these days have wheel bearing assemblies that cannot be serviced at Express Car Care.  When the bearings go bad, we simply replace the entire wheel bearing assembly.

For those vehicles with wheel bearings that can be accessed, we can do some preventive maintenance.  You may have heard the phrase “pack the bearings”.  With this procedure we remove the bearings, carefully clean them and inspect them for any imperfection or wear.  If the bearings can be reused, we reinstall them and pack them with grease.  If not, we put in new bearings.  Check your owner’s manual or ask your service adviser if your bearings can be serviced, and if so, when it should be done.

Taking care of bad bearings is extremely important.  When bearings go bad, they generate tremendous amounts of heat – enough to lock up the wheel.  That’s not a good thing at any speed.  In some cases the wheel can even fall off!  Either of these situations can cause a serious accident.  So have your wheel bearings inspected, especially if you suspect a problem and replace them right away if there is one.  Don’t let yourself be caught off-guard.

Severe Service Schedule

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Severe Service ScheduleSome of our customers at Express Car Care are surprised to learn that there are actually two service schedules for their vehicles.  One is the regular schedule and the other is the severe service schedule.

Let’s look at what the manufacturers say constitutes severe driving conditions, and let you draw your own conclusions:

  • Most of your trips are less than four miles
  • Most of your trips are less than ten miles and outside temperatures are below freezing
  • The engine is at low speed most of the time – not on the highway
  • You operate your vehicle in dusty areas
  • You regularly tow a trailer, carry heavy loads or a car-top carrier
  • Stop and go driving
  • Driving in very hot or very cold weather

So you can see that a lot has to do with how you drive, but some has to do with where you drive.  Some areas of the country will be more or less severe than it is here in Denver.

For many, normal driving includes elements of severe service driving.  So how do you know?  Picture a line with “regular” on one end and “severe” on the other, and make a judgment on where you fall.

If your regular oil change recommendation is 5,000 miles and the severe service recommendation is 3,000 -when should you change your oil?  For some, it’s closer to 3,000 miles.  For others, it’s closer to 5,000 miles.  Your service adviser will be happy to have this discussion with you and help you sort it out.

If you drive where the air is dusty or polluted, fluids will become contaminated and filters will get dirtier more quickly.

So make an honest evaluation of your driving conditions in and around Denver.  You’ve made the commitment to take care of your vehicles, so it only makes sense to follow the right schedule.

Give us a call for advice for your car based on our local Denver driving conditions.

 

Improve Fuel Economy

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Improve Fuel EconomyLet’s review some things that Denver residents can do to improve fuel economy.  Bottom line – the better you maintain your vehicle, the less fuel you will use.  It all adds up in a big way.  For example, replacing your dirty engine air filter will pay for itself in fuel savings before your next oil change – and will keep saving you money after that.

A clean, well-maintained fuel system really pays big dividends for budget conscious Denver residents.  A clogged fuel filter wastes gas.  So does a dirty fuel system, grimy fuel injectors and plugged up PCV valves.  A fuel system service decreases the gas you use, and increases the power – so you can’t go wrong.

Some of us might ignore our check engine light.  But fixing the problem that caused the light to come on will usually improve fuel economy as well.

It may simply be time for a tune-up.  Tune-ups should improve your fuel economy as well as keeping your vehicle in good running condition.  Don’t overlook the routine maintenance items, like scheduled oil changes, transmission and cooling system service.  Dirty or low fluids actually use more fuel.  Just look at your recommended service intervals in the owner’s manual, or ask your helpful Express Car Care service adviser for the schedule.

Don’t overlook your tires.  Under-inflated tires waste gas because they don’t roll easily and cause the engine to use more fuel to turn them.

Check your gas cap to make sure it isn’t worn or doesn’t leak.

None of these things are very complicated or expensive and when you maintain your vehicle properly, you will improve fuel economy today and prevent repairs tomorrow.

Alternator Replacement

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Alternator ReplacementSome drivers have probably noticed a bunch of warning lights on their dash when they start their engine.  They flash on to test the circuits and then go off if everything’s OK.  One of the warning lights looks like a car battery.  Its job is to tell you if your vehicle’s battery isn’t charging properly.

Most motorists probably know that their battery stores electricity – enough to start the engine and get moving.  but that’s about it – you can only get a few miles on battery power alone.  You need an alternator to generate enough electricity to run your vehicle’s engine and power your electrical accessories, like the stereo, power seats, heater fan, on-board computers, and so on.  On top of that, the alternator needs to recharge your battery.  So when your alternator isn’t working, there isn’t going to be enough electricity for all of those things.  When your alternator fails, you aren’t going very far.

So why would your alternator not work?  Usually they’ve simple worn out.  Alternators are driven by your serpentine belt and spin 2 to 3 times faster than the engine – that’s a lot of work.  The bearings wear out, as do the copper wire coils and magnets that generate the electricity.

There’s no sense in hobbling along with an alternator that’s not working properly.  It will fail at some point and leave you stranded, then you’ll be wishing you would’ve had an alternator replacement sooner.  You need to get a bad alternator replaced as soon as you possible.  When you come to Express Car Care for an alternator replacement, someone knowledgeable will install an alternator that meets your specifications.  Some drivers use a lot of additional electrical products in their vehicles, like computers and DVD players.  Others may regularly tow a camping trailer that is putting extra pressure on its battery as they drive.  If that sounds like you, you’ll need to think about upgrading to a more heavy duty alternator.  Come in and let us help you figure it out.

Brakes Service

Oil Change

Suspension

Transmision Service

Engine Service

Auto Tips & Tricks