Q: when the a/c is on it blows heat. sometimes.

asked by on

most times the a/c works properly. other times it blows heat when the a/c is on. I will turn off the car and it will reset itself.

Depending on the type of vehicle and system design, you most likely have an A/C blend door actuator stuck in heat mode or an A/C relay not engaging. It may also take a moment for the air to actually start blowing cool if it is low on coolant. Have a certified technician from YourMechanic come to your car’s location to diagnose your AC system and let you know what needs to be done.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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
  1. Home
  2. Questions
  3. when the a/c is on it blows heat. sometimes.

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: How do I use the rear seat warmers?

The rear seat warmers are controlled by the Rear Seat warmer switches, which are on the inside of both rear doors. To use a rear seat warmer, press the corresponding switch. Press the switch again to turn off the warmers....

Q: Car smells like something is burning or wet

Hello there. Based on the description you've provided, this seems to be a possible coolant leak onto a hot component of the engine such as on the exhaust pipe. Any part of the cooling system could be leaking. A good...

Q: White smoke coming out of hood when idle / stopped

This sounds unfortunately like a blown head gasket problem. The fluctuation in temperature and white smoke is usually a sign of this. I would suggest having the coolant tested for traces of combustion gases which will indicate if the head...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.