Automotive air conditioning repairs can be some of the most expensive problems that car owners will have to deal with. The worst-case scenario of an internal compressor failure that has spread chips of metal throughout the system can cost thousands of dollars to repair properly on some models.
On the other end of the spectrum, a simple O-ring failure that has leaked out the vehicles Freon should only cost a couple of hundred dollars, if that. The symptoms for both the best and worst case scenario are basically the same to the driver. This is the driver turns on the air conditioning and only warm air blows out of the vents.
This is why I recommend getting a quick education about how the system works and learning what questions to ask the repair shop. The article to follow is just my opinion about car air conditioning repair and why you need to be careful when getting this system serviced.
Sometimes my jaded insider point of view can make people in the auto repair business angry because I might suggest that foul play abounds in the business. If you are an honest car mechanic that happens to work in an air conditioning shop that does the right thing then this article does not reference you, so there is no reason to send me flaming e-mails.
In my area of the United States automotive air conditioning has become a big business. Motorists use the system about nine months out of the year here in south Florida. Many specialized repair shops have sprung up to capitalize on the abundant amount of air-conditioning jobs that are available.
I have run across shops that use the extreme heat and humidity as leverage against car owners. No matter what the situation is or how hot it is outside, you have the right to ask questions and see the failed parts. If the shop says that you need a compressor replacement ask them why or what is wrong with the compressor. Ask the mechanic if any Freon is still in the system.
If the answer is the Freon has leaked out then a test charge should have been installed to properly diagnose a failed compressor. If the answer is yes there is still Freon present in the system, then ask the shop if they connected a manifold gauge set or what methods were used to make that determination.
Get specific and question what the pressure readings where on the low and high sides. Low side pressure should be around or close to 35 and 45 psi with the compressor engaged.
The high side pressure will vary with the outside temperature and the kind of system installed on the vehicle but regardless it should have readings of over 150 psi with the compressor engaged.
If a compressor has failed internally but engages, a common symptom would be lots of noise. The worst-case scenario of a compressor failure is certainly a possibility. In fact this is one component that experiences a lot of stress throughout its life. How long will an air conditioner compressor last? This is just an estimate and my opinion based on experiance. Most automobile air conditioning compressors will last about 100,000 miles (some much more, some less).
I have another article on this site that you can view about what I consider to be the most common car air conditioning repairs. After turning wrenches for more than 25 years what I see most often is that the Freon will leak out of the system until the pressure gets so low that the compressor will not kick on.
There are a lot of sealing O-rings and threaded connections in an automotive air conditioning application. These can loosen up and start to move over time, wearing away at the rubber O-rings. The system does not hold that much total Freon and even a small leak will cause the system to be inoperative after a while. All too often automotive consumers are approached by a repair shop representative with a number or cost of the repairs.
The shop is looking to keep it simple and may be prompting you for a yes or no answer. This is when we need to start asking questions. Answers to your automotive questions that don’t seem to make sense or raise doubt should be researched.
When in doubt take the vehicle to another location for a second opinion. I recommended you do not inform the second shop of the first repair centers diagnosis.
I have written a lot of Diy information about this system on my other website that is geared towards driveway mechanics. These are articles that you can read to gain more knowledge about how car air conditioning works.
If you are interested in reading more articles about the automotive business this next link will take you back to the automotive news section.
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