AUTONET TV

In That Case? (Transfer Case Exchange)

Ever wonder how all-wheel-drive or 4-wheel-drive vehicles get the power from the engine to the front and rear wheels? The magic happens in what's called a transfer case.  In some all-wheel-drive vehicles, it's sometime called a power take-off unit, or PTU.

Inside the transfer case is a set of gears.  And to keep those gears meshing smoothly, they have to be lubricated and kept cool.  What does that is called transfer case fluid. Depending on your vehicle's type of transfer case, it is filled with either an automatic transmission fluid, a gear oil that's a bit thicker or transfer case fluid designed to be use for your transfer case.

As happens with all lubricating fluids, the transfer case fluid has things in it that break down the older they get.  They have corrosion inhibitors, detergents and anti-foaming agents that keep the lubricant from getting air bubbles in it. Transfer cases don't have filters in them to clean out impurities.

If you don't have your transfer case fluid exchanged for fresh, you risk damage to the case, and that can run into thousands of dollars.  So the wise driver makes sure the fluid is changed according to the manufacturer's recommendations.  For many vehicles, that is every 30,000 mi/50,000 km, but some require it more frequently.   Your vehicle service facility can advise you on what your vehicle's optimal interval is.

During the fluid exchange, any metal filings that may have come off are cleaned off of the drain and fill plugs that are usually magnetized to catch the stray metal pieces.

If you hear grinding noises coming from under your vehicle or if it is having trouble shifting gears or going in and out of 4-wheel-drive, those could be signs your transfer case needs service. In that case, have our technicians check it out.  The best plan of action?  Keep your transfer case fluid maintained and it should keep you heading down the road for years to come.

Hill's Auto Repair, Inc.
22829 colton point rd
Bushwood, Maryland 20618
301-769-2400

Light Up your Life (Headlamp Replacement)

Did you know that having a burned out headlight can result in your rearview mirror reflecting some flashing lights? In other words, you might get pulled over by the police for only having one working headlight, because in most places it's against the law. 

Not only is it illegal to drive with one headlight burned out, but it's also dangerous. You can't see down the road nearly as well at night with only one headlight, and other drivers can't see you as easily either.

The good news is many newer vehicles warn you when one of your headlamps burns out. When that happens, have it taken care of as soon as you can.  While there was a time when all headlamps were pretty much the same, the same isn't true these days. There are halogen, Xenon, LED and other technologies used in modern vehicles.  Plus there are sealed beams (like those on older vehicles) and capsules.

If you have a burned out headlamp, ask your service advisor for recommendations.  Usually when one side goes, the other isn’t far behind. Many suggest replacing both headlamps at the same time.  Your vehicle's owner's manual can tell you what the manufacturer recommends.  You also can ask your service advisor about upgrading to a headlight that might give you better visibility. 

In order to make sure you're able to see down the road the way your vehicle was designed and not blind oncoming drivers, it's vital that new headlights be aimed properly.  That's another good reason to have this service performed by a technician. Now, that's a really bright idea.

Hill's Auto Repair, Inc.
22829 colton point rd
Bushwood, Maryland 20618
301-769-2400

Not-So-Smooth Operator (Transmission Signs of Trouble)

You are heading down a flat, newly paved street when all of a sudden you feel it.  Your vehicle jumps a little bit when you're accelerating and changing gears.  You know it's not the surface of the road because it's smooth as silk.  So what did you just feel?

That kind of jumping—or grinding or slipping—during gear changes could be a sign of trouble in your automatic transmission.  And it's important to get it checked out fairly soon because some transmission problems that aren't fixed early can lead to more involved and expensive repairs.

By far most vehicles on the road in North America have automatic transmissions, and they are workhorses.  Unlike early cars with balky, hard-to-shift manual transmissions, the latest automatics allow you to drive without having to even think about gear changes.  But you should know about a few signs of trouble to look for if they ever start showing up.

• When you first get going and shift your vehicle from Park into Drive, do you feel a slight pause?
• How about when you shift into Reverse?  Is there a little lag?
• Does your vehicle sometimes shake when you're traveling down the road?
• Do you smell something burning in your engine compartment?
• Do you hear a clunk when your vehicle shifts?
• Do you have spots of a reddish or brown, oily fluid in the driveway under your vehicle?

If you do, these are worth getting checked out at our service center.  When automatic transmissions start to show signs of wear and age, it can be because of a number of reasons.  They can be caused by your transmission fluid getting old and contaminated, or its level may be low.  The gears can be worn.  You may have a leak somewhere in your transmission.  Or transmission problems might be caused by a computer problem.

Transmission issues aren't always expensive to repair.  Sometimes there may be a leak in a hose or gasket.  Or a computer needs to be reset.  Other issues may be much more involved.  This is why it's important to get your vehicle checked out when you do notice something doesn't feel, look, shift or smell quite right.  Everyone wants their automatic transmission to be a smooth operator.

Hill's Auto Repair, Inc.
22829 colton point rd
Bushwood, Maryland 20618
301-769-2400

Your Vehicle's Hissy Fit (AC System)

When you hear hissing sounds coming from your vehicle, you might start thinking the worst.   One type of hissing coming from around your air conditioner may be a normal sound, or it could be a sign of serious trouble.

First - the normal sound.  When you turn off your vehicle, the refrigerant goes from its high-pressure side to the low-pressure side. Some of those noises are normal.  But when it hisses all the time, that's another story.

One cause could be that the refrigerant is leaking.  Air conditioners are fairly complex systems that involve various pumps, hoses, valves and motors.  When your air conditioner is cooling, the refrigerant changes from a gas to a liquid and back.  That refrigerant is under pressure, and there are many places it can leak from. 

A hissing sound can also be a failed valve in your air conditioner's compressor.  It is what controls the refrigerant's pressurization.  It's important to have this fixed fairly quickly after it develops a problem because when it isn't, that can lead to more extensive—and expensive—repairs.

If you hear screeching coming from your air conditioner at the same time you hear hissing, your compressor may be on its last legs. It could also be a defective clutch. 

Any time you hear a noise you haven't routinely heard before, bring your vehicle to us so a technician can check the various components and properly repair the problems.  Air conditioning systems are complex and are best handled by a professional with the right tools and equipment.  When your AC has a hissy fit, let us cool it off and you at the same time.  

Hill's Auto Repair, Inc.
22829 colton point rd
Bushwood, Maryland 20618
301-769-2400

Bad Vibrations (Brake Rotor Replacement)

If you’ve ever stepped on your brake pedal and felt your vehicle vibrate, that’s a signal that you shouldn’t ignore.  A pulsating brake pedal is a sign that something is wrong.  Braking action should be smooth, sure, and quiet, not shaky and noisy.

Most newer vehicles have disc brakes, called that because they have a round, flat disc connected to each wheel.  Those discs are the rotors. Other parts called brake pads are squeezed against those discs when you press on the brake pedal.

Remember that vibration we mentioned? That can be caused by the rotor not having a straight, true surface. Rotors can heat up from friction and warp.  They can become thinner from constant wear.  Rotors can rust from the elements they’re exposed to, such as rain, snow ice, and salt.  They can get grooves in them from so many contacts with the pads. 

The signs of worn rotors are vibrations, grooves on the rotor (which you can see sometimes through open spots in the wheel) noise such as squealing or scraping when you brake, and increased stopping distance.   

While it used to be common for rotors to be machined (shaved down to restore their flat surface), newer vehicles have thinner rotors, so your service adviser may suggest you replace rotors when they start showing signs of significant wear.

Brakes are important safety equipment for every vehicle.  They enhance your control while driving, so it’s important that they be regularly inspected and maintained.  A good time is when you have your tires rotated. A technician can then look at all components of your brakes and recommend any service you may need to keep your brakes in top shape.

Hill's Auto Repair, Inc.
22829 colton point rd
Bushwood, Maryland 20618
301-769-2400