Skip the auto shop - Our mechanics make house calls

Q: A/C blows warm air

asked by on

Our summer temperatures are over 100 degrees every day! I purchased my used car from the original owner and I’m not aware of the car’s situation/maintenance before I purchased it. The A/C progressively has been blowing warmer and warmer air. So I serviced it and it’s blowing ice cold again. I was told by the tech that the compressor is going bad. After service, as car was sitting in the sun and the a/c was blowing nicely cold, then he hit the gas, revved the engine and it blows Ice Cold. Revving it doesn’t make the electric fan spin any faster. I do spend a lot of time at idle and need it to be cold in that situation, for example while waiting for school to let out, with another child sleeping in back seat. When we get to driving again, it does get cooler, but I’m thinking that’s just due to the higher airflow through the condensor, not a weak compressor? Do you think it’s a bad compressor?

A: Hello. It sounds like you may have a weak c...

Hello. It sounds like you may have a weak compressor. The compressor is a pump for the A/C system and when it gets weak, it does not pump as well as it should. When this happens the air won’t be as cold at idle because the compressor is weak. When you increase the idle the compressor is forced to work harder and the air will be cooler. Before the A/C compressor is replaced I would have the A/C system inspected to make sure it is operating properly.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Transfer case is stuck in neutral.

Hi there. With the vehicle engine running but the transmission in park or neutral, put the transfer case in 4H and see if it will engage. Then try to put it into 4L and see if it will engage. If...

Q: Do I need to keep refrigerant in my A/C compressor during winter months

The refrigerant inside the compressor has nothing to do with the compressor pulley turning freely when the compressor is not engaged. If the pulley is not turning free then the bearing inside the pulley will need to be replaced. If...

Q: Engine damage

It is certainly possible that the damage to the engine was done prior to you purchasing it. This does not necessarily mean that the people who sold it to you were aware that the issue was there. Sometimes things happen...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...