Q: My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air.

asked by on

My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air. What is wrong with it?

My car has 165 miles.
My car has an automatic transmission.

When the car is moving, versus stopped, there is more air flow over the condenser (the heat exchanger in front of the radiator) and that airflow is essential to system operation. To maintain airflow when the car is in stop and go traffic, or is completely stopped, condenser fans will come on automatically. If the fans don’t come on, the circumstance you have could occur. You might also have a low state of refrigerant charge. Other possibilities are that the compressor clutch is not cycling as intended or that the condenser might be blocked or dirty. And, of course, you could have a combination of these issues. To get this resolved, the best thing to do is request an air conditioning system inspection. The responding certified mechanic will come to your location, pinpoint the fault and get this resolved for you. Once diagnosed, the mechanic will be in a position to give you a repair strategy to get the A/C system fully functioning and he or she will estimate the cost of the required repair. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My car AC blows cold air when the car is moving but when I'm at a red right it starts blowing warm air.

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: Driver seat loose / moves slightly on acceleration and stopping.

Hi and thanks for contacting YourMechanic. The driver seat has a gear track that the seat rides on and allows the seat to move forwards and backwards. The gears are probably worn and need to be replaced. As for the...

Q: Where is MAP sensor located? 2002 Isuzu Turbo diesel Rodeo

Hello - the MAP sensor is located on the intake manifold, near the back. It has a flat, 3-wire electrical connector. For assistance, I recommend a MAP sensor replacement service by a mobile, professional mechanic, such as one from YourMechanic,...

Q: Front driver side tire moves side to side when jacked up

If you can move the tire in and out when on a jack then you may have a few different possible problems. The inner or outer tie rod ends may be worn. Your steering gear may also have worn bushings....

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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.