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?

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: Periodic smoke from tail pipe, on start up. not every time

If you have a small amount of white smoke out of your tailpipe in the morning is normal condensation that is being burned off from inside your muffler. You would only have to worry if you notice your coolant getting...

Q: A/C problem on 06 Mitsubishi Lancer ES

If you are getting power to the compressor but the compressor clutch is not engaging then you may have a bad clutch coil. Sometimes the clutch coil will get weak and not be able to engage the clutch when it...

Q: Advice on buying a used European car

Unfortunately, "used" and "reliable" are two words that typically don't go well together with European cars. They are expensive cars to repair and fix. A long time ago, the Volvos were good cars and a '93 240 wasn't a bad...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.