Skip the auto shop - Our mechanics make house calls

Q: A/C blows warm when car is idling

asked by on

My a/c will blow cold while driving but at an idle it blows warm any ideas what could be going on? Both fans working when i looked while the car was running and a/c on. Refrigerant tested good as well

My car has 107000 miles.
My car has an automatic transmission.

A: First check to make sure the front of the c...

First check to make sure the front of the condenser is clean and free of bugs or debris. Try and spray it with a lower pressure hose or car wash hose from farther away and clean it out as best as you can to see if it helps. When an A/C system works well on highway, but gets hot at stops, this is due to the system being low on refrigerant, blocked condenser fins, fans not working or the compressor is not working good at idle. If cleaning the fins do not work, then have a mechanic check the pressures to see why it is blowing warm at idle.

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・Save up to 30%

Get a quote

What others are asking

Q: Check system battery

Your check battery light may come on when any part of your charging system is not working properly. This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator...

Q: How do I adjust the remote start passenger seat?

When the remote start passenger seat is turned on, then the front passenger seat’s seat warmers will automatically turn on when the vehicle is started via remote start. To turn this feature on or off, follow these steps: 1. Press...

Q: Why does my car blow heat then stop and then start up again??

This may be a sign of a faulty blower motor. As you know, these have electric motors in them that wear out over time and will begin to make squeaking or grinding noises as the bearings begin to wear out....

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...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.