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: steering wheel vibrates at a certain speed range

Hi there: Steering wheel vibration and battery or electronic issues are usually not related, so you're OK there. In regards to the shaking above 100 km/hr issue, that's usually caused by poor wheel / tire balance. As long as the...

Q: Air conditioning compressor tight; belt squeaks

Hello, Your Dodge Dakota has a single belt that runs all of the engine accessories. If you are experiencing a belt squeak, it is important to enlist the help of a certified mechanic to diagnose the cause of your issues...

Q: Heater/ac blower resistor

This may be either the resistor or the wiring connection to the resistor. i would recommend first eliminating or confirming the resistor as the problem since this is much easier to test than faulty wiring. Many blower resistors control current...

Related articles

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.
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.