Tuesday, June 1, 2010

Auto Air Conditioning Repair Basics: Common Symptoms & Problems

by Marjorie, Cars for Keeps Social Media Manager

A broken air conditioner in your automobile gets put at the bottom of the "to-do" list all winter long. As we move into another warm, humid Michigan summer, however, suddenly having a car air conditioner that works - and works WELL - is of the utmost importance. Who wants to arrive at a meeting, the mall, or a friend's house sweating and flushed by stale, hot car air?

Having an auto air conditioner that "kind of" works may get YOU by, but faulty air conditioners can cause bigger damage to your car down the road if left unattended. An air conditioner running low on coolant, on dirty coolant on faulty electrical wiring can end up ruining the entire air conditioning compressor. Car air conditioners are connected to the rest of the vehicle's electrical system, meaning a surge or problem with the air conditioner can cause problems with the rest of the car, causing poor idling, fuel inefficiencies or drained batteries.

Generallly, auto air conditioners are fast, easy and inexpensive to fix. Most car air conditioning problems are coolant-related, and may often be as simple as getting a coolant flush, refill or fixed leak.

With that said, your car's air conditioners is not one of those devices most technicians recommend fixing at home, unless you're a qualified mechanic. Most do-it-yourself instructions for fixing broken auto air conditioners contain scary phrases, like "it is illegal to release freon gas into the atmoshere" and "be sure to wear proper hand and eye protection". Plus, there are many different things that could be wrong with the car's air conditioning system.

Here are a few of the problems most commonly found in auto air conditioners:

1)
Coolant and/or Refrigerant Leaks. This generally applies to older, less computerized vehicles. Refrigerant can run out on its own over the course of time, or leaks may have developed in the car's AC compressor or one of its hoses. If your vehicle has never had a coolant flush or refill and it's pushing 150,000 miles or more, it's probably time.

2)
Noisy AC Compressor. Noises that occur when your car's AC is turned on can come from minor engine noises or hoses, but they could also be symptoms of problems with the compressor. If the problem is the AC compressor, it will likely have to be replaced.

3)
Fluctuating Temperatures. When a car's AC blows out air with sporadic temperatures, it's often likely that moisture is building up in one of the hoses or assemblies, causing ice to accumulate and clog. Removing ice from a car's air conditioning assembly is a short and easy procedure.

4)
Faulty Car Electrical System. A weak car battery can cause your auto air conditioner to function weakly or not at all. Car batteries need to have enough voltage to trigger the AC compressor, and while it may be strong enough to run the rest of your car, it may still be too weak to run your car's air conditioning.

5)
Bacteria Buildup. Funky smells emanating from your car's air conditioning vents are likely caused by a bacteria buildup in the evaporator. Good auto mechanics (like Cars for Keeps!) will have the proper tools to flush the evaporator out quickly and without much cost.

So what are some basic ways to tell if any of these are a problem for your car's air conditioning unit? Here's a basic checklist of symptoms which indicate something is wrong with your auto AC:

- If the AC system doesn't produce cold air (duh)
- If the fan or blower doesn't work
- If the fan, blower or AC is noisy when turned on
- If one of the dashboard controls malfunctions
- If the vent, car heater or defroster are having problems working correctly
- If the air conditioning smells funky
- If the car has a tendency to overhead
- If the air filter or dryer have never been replaced, or if the AC has never been serviced before

If one of these symptoms applies to your car's air conditioning system, it's probably time to have it inspected by a mechanic. Caught early, most auto air conditioning problems are fairly easy and inexpensive to fix.

Stay cool!

386 comments:

1 – 200 of 386   Newer›   Newest»
Anonymous said...

It is true that you can fix your car air conditioning unit on your own, but it is better if you leave that kind of job to the professionals just like those in the auto repair in Indianapolis which I go to every time I have my car checked.

Just a friendly advice, if by any chance you visit Indiana, the car repair (Indianapolis, IN) I mentioned can do wonders for your car.

Ac repair said...

sensible Ac Maintenance advice, prevention is always better than cure so my advice is to ensure regular maintenance especially before summer arrives. This should avoid unexpected repair bills due to breakdowns.

Ashlyn said...

Having a car without air conditioner is a big prestige issue among society people. Not only that even faulty air conditioner can cause damage to your car, it’s better to solve out using instructions of your own if it is a minor problem rather than waiting for a Car Mechanic.

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Clearwater Air Conditioning Repair said...

If you notice unusual in your car air condition just try to do some remedy by reading the basic manual or refer to the expert... don't let get to be a bigger problem....

NYC Air Conditioning & Vent Cleaning said...

I am facing such a problem with my car AC, when I turn on my A/C, there is a strong vibration coming from the A/C compressor or it takes about 1-2 minutes & the compressor gets almost too hot to touch. The lines coming from the compressor are cold & the truck cools off just fine. I don't have a clue what could be wrong. I am currently not running the A/C for fear of tearing it up.

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Unknown said...

I agree that it would be best to have the AC problem fixed at an early stage. There are signs that can give the owner an idea that there is something wrong with his AC. I really liked the discussion that you gave about the possible causes of such problems.

I regularly have our air conditioning (Cary and other places)checked by professionals. It is most recommended to have experts in (Cary) HVAC check the device bi-annually. That way, the device would be sturdy and well functioning.

Very informative. Thanks!

HyunChard said...

I really don't understand this Split System thing in airconditioning, would someone don't mind explaining it here?

Mike's Vent Cleaning said...

Thanks for the tips to repair.It is very important to maintain the air conditioners to get the best service from them and also look after the environment by not polluting the clean air around.

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The most likely cause of an automotive air conditioner cooling problem is no refrigerant in the system. One of the first things you should check, therefore, is compressor engagement. If the compressors magnetic clutch is not engaging when the A/C is turned on, the problem may be a blown fuse or a wiring problem. If the fuse is blown, replacing it may restore cooling temporarily. But the underlying reason for the fuse blowing in the first place needs to be identified and corrected to prevent the same thing from happening again.

Anonymous said...

Checking your HVAC for maintenance is very important specially every summer. This will help us keeping our home in a comfortable temperature......Better prevention is always necessary to the electronic goods....

Mike's Air Conditioning said...

It is surely very important to know the basics of repairing a system when there is a break down.The air conditioners have to be serviced and maintained for better performance.

Peter said...

Take it from someone who knows. It gets hot in the south, especially in Virgina, and reliable air condition repair is a must. No one wants to get all sweaty or suffer from heat stroke. Don’t wait too long to keep cool.

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Anonymous said...

My question is somewhat advanced. I have a 1994 Buick Roadmaster with auto climate control. I have a gauge set, a leak detector, and a vacuum pump. Anyway, gauge set results are Low Side 40/20, High Side 130, Outlet air temp 57, Outside Temp 74, Outside humidity 45%. New Compressor was installed 4 years ago, but could it be going already? No odd noises.

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Selecting a good dependable service for air conditioning repair, but with some of the aforementioned precautions and tips, your selection of a good AC company will be simplified.

Bailey Lovett said...

It is very interesting and useful post you have shared. How often should the A/C system be Inspected/Service? Can you give me information?

Nicole Vickers said...

When our car AC malfunctioned, we had it fixed immediately. I agree that bacteria build-up is one of the most common causes of air conditioning failure. The tips you shared can be very helpful for those who're having a hard time fixing their car ACs.

Sebastian Gaydos said...

A faulty air conditioning is hazardous for the driver and passengers of a car. For me, a "kind of works" kind of AC is more energy-consuming than a non-working one. That's because such a system releases dangerous CFCs into the atmosphere (especially if it's an old model).

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Kam said...

Does the time when you need to be re-filling your ac depend on the amount of usage or the age of the vehicle, i.e. if your car is in a colder climate not used so much will it last longer or does the coolant deteriorate just as quick?

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Very useful in understanding of common AC problems. Thanks.

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Vannessa Gabbett said...

A lot of people really like to fix their own vehicles, but sometimes, repairing your air conditioning unit’s parts or components can be complicated. That’s why if you think you can’t handle it on your own, it would be better that you ask for the help of a qualified and certified mechanic. Fixing it yourself, without having the right skills, may make it even worse. So to save you a lot of time and money, find a mechanic that you can rely on and can do the job right away.

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I read your blog and it informed well of the common car AC problems. For instance, AC not giving off chilling air, just room temperature. air.

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Electrical problems with car air conditioners can cause the same complaint of my air blows hot. Learn what to look for and see how a little corrosion can cause air conditioning electrical problems.

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techprocartools said...

The three tools such as: Recovery System, Vacuum Pump, Pressure Gauges are critical to a proper AC repair. Before any repairs can be done on the AC system, the old refrigerant MUST be recovered. The only way to properly do this is with a recovery system such as the one above. This is actually required by law, so don’t skip this step. The vacuum pump is used after the repairs have been made, it pulls all air and moisture out of the system, so that when the system is refilled, only refrigerant goes into the system. The tools shown above are not tools that the average at home mechanic has, so if you don’t like the idea of shelling out big bucks to buy this equipment, you can always bring your car to a repair shop and pay a small amount to let them do the Recovery before you begin repairs, and the vacuum after the repairs.

The most common misconception about car AC is that cold air is created. Technically heat is being removed from the air. Although it sounds like a little nitpicky detail, it is actually quite important in understanding how the system in your car keeps you cool during the summer.

Source: A/C Drive Belt Installation Tools

Jhon Marshal said...

The blog article very surprised to me! Your writing is good. In this I learned a lot! Thank you!
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Anonymous said...

I am really very agree with your qualities it is very helpful for look like home. Thanks so much for info and keep it up.
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bowesexxon media said...

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rachelperez944 said...

It is so hard to see what is it I took it to a local auto parts to have it checked with one of those diagnoses check thing and it says it detected an improper voltage level on the circuit with thenlighr commended on and the cause was an open or short circuit in the ECM WHATEVER that means but do you have any idea if thats the case then that will fix the problem because i had someone look at it and said it could be the compressor and also checked rhe fuses which in our chevy cobalt have so many fuses we actually found a blown out one and some of the lights and stuff that wasn't working worked agian but the ac still doesn't blow cold air The diagnoses also says malfunction indicator lamp control circuit fault then goes on to the explantion and probable cause

rachelperez944 said...

Thanks so much for this blog it is so accurated but i wish i could find what's really wrong my cars compressor went out so I think it did or as I read may also be the clutch or coil rubbing or also oil or lubricant don't know or could also be clogged up or voltage or cicuit can't tell could these things cause a fuse to go out because we did find one and put in a new one and saw the problem resolve like the info cage on the steering because it's electric weren't working or the passanger air bag light also the ac button lights had gone out but once the fuse was replaced the turned on again but still there is no sign of compressor working so I was told by a outside machanic friend and also it does not blow out cold air I would like to find the cause of the problem could you please help or give me any idea as to what i could do

rachelperez944 said...

Thanks so much for this blog it is so accurated but i wish i could find what's really wrong my cars compressor went out so I think it did or as I read may also be the clutch or coil rubbing or also oil or lubricant don't know or could also be clogged up or voltage or cicuit can't tell could these things cause a fuse to go out because we did find one and put in a new one and saw the problem resolve like the info cage on the steering because it's electric weren't working or the passanger air bag light also the ac button lights had gone out but once the fuse was replaced the turned on again but still there is no sign of compressor working so I was told by a outside machanic friend and also it does not blow out cold air I would like to find the cause of the problem could you please help or give me any idea as to what i could do

rachelperez944 said...

It is so hard to see what is it I took it to a local auto parts to have it checked with one of those diagnoses check thing and it says it detected an improper voltage level on the circuit with thenlighr commended on and the cause was an open or short circuit in the ECM WHATEVER that means but do you have any idea if thats the case then that will fix the problem because i had someone look at it and said it could be the compressor and also checked rhe fuses which in our chevy cobalt have so many fuses we actually found a blown out one and some of the lights and stuff that wasn't working worked agian but the ac still doesn't blow cold air The diagnoses also says malfunction indicator lamp control circuit fault then goes on to the explantion and probable cause

Gennie said...

Thanks a lot for sharing this helpful article about AC repair,.
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Unknown said...

You have got some great posts in your blog. Keep up with the good work.
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Unknown said...
This comment has been removed by the author.
Unknown said...

Rachel need an ac repair guy who can replace the fuse because it might not correctly installed by you in the ac system.

AC Repair in Dwarka said...

We are one of the famouse ac repair serices provider in dwarka including all other areas in Delhi. Hitachi AC Repair Services in Dwarka

Boris1White said...

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bowesexxon media said...

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steward said...

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Jr. Williams said...

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Unknown said...

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Unknown said...

Hi guys,
Thank you so much for this wonderful article really!
If someone want to learn more about the Air conditioning repair I think this is the right place for you

Gennie said...

Thanks for this helpful and informative blog about AC repair,.
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Unknown said...

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Jr. Williams said...

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steward said...

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steward said...

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Unknown said...

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Thank you so much for this wonderful article! Here we all can learn a lot of useful things and this is not only my opinion! Even BLNCK corp. and http://www.comfortairnow.com/ confirmed it!

Austin said...

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Austin said...

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Mr. Cars Auto Maintenance said...



Very well said, and thanks for these tips and advices. Mr. Cars Auto Maintenance is Dubai based auto air conditioning service & car dent repairs company.

Terrance McDaniel said...

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Jhon Marshal said...

Great article, this is such an interesting and informative article.
top rated

Unknown said...
This comment has been removed by the author.
Unknown said...

If you have a broken auto air conditioner then you can get repaired from outside otherwise you can buy new air conditioner from biggest car accessories online in India

Unknown said...

It can happen also when you have broken vent clips in your car. Vent clips are the little plastic pieces which help control the direction of air flow in your vehicle.But you can easily repair your broken vent clips at
Venttabs.

Unknown said...
This comment has been removed by the author.
Unknown said...
This comment has been removed by the author.
Unknown said...

This is a great article thanks for sharing this informative information. I will visit your blog regularly for some latest post. I will visit your blog regularly for Some latest post. http://www.csacservices.com/

Anonymous said...

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Unknown said...

thanks for the you write a article and share information ..
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sierhymes said...

What would be the reason it's over 1200.00 to fix

Unknown said...


thanks fro sharing this wonderful tips….its really useful for all



Auto Mechanic | Vehicle Maintenance

Unknown said...

Everyone wants to have a energy-efficient and cost-effective system at his place.They are energy efficient units with benefits of mobility, easy installation, cost and convenience. Moreover they are ideal for small homes.Air conditioner's require proper maintenance because air conditioner loses it's 5 percent efficiency every year if not maintained properly.
http://www.airmart.com.au/products/residential-solutions/central-ducted-refrigerative/

Padhma` said...

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Dorothy said...

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Unknown said...

I appreciate the tips on AC repairs. I had no idea that just some dirty coolant could cause the entire compressor to break, this could end up costing a lot more money than just getting the coolant changed out. My mom is debating on having her AC serviced before summer comes, I will be sure to share this information with her. http://www.jasonsautorepair.com/repairs

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