Skip the auto shop - Our mechanics make house calls

Q: When I switch from heat to AC, the heat still blows?

asked by on

When I turn the switch to AC, it makes no difference. Heat continues. AC compressor is kicking on.

My car has 60000 miles.
My car has an automatic transmission.

Hi, thanks for writing in. If your heat is still blowing when the air conditioning is turned on and the compressor is working, then it is likely that the blend door actuator has failed. The blend door actuator is responsible for moving the blend door. The blend door is inside the air distribution system of your vehicle. The blend door is responsible for blocking off the heater core or the evaporator to allow air flow to which ever one is selected. During the air conditioning selection, the blend door should be blocking the heater core to allow cold air to come through the vents. I would recommend having your blend door actuator replaced by a qualified professional, such as one from YourMechanic, to resolve the issue you are having. If you would like help getting this situation inspected first, consider having an expert automotive technician from YourMechanic come to your home or office to inspect your AC system for you, and make or suggest any repairs as needed.

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!
  1. Home
  2. Questions
  3. When I switch from heat to AC, the heat still blows?

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: Cost to restore the tires to original setting

The cost to restore your suspension to stock condition can vary greatly. Your geographical location can affect parts pricing and availability, labor costs, etc. The most accurate way to price this would be to have the vehicle inspected by...

Q: Passenger door won't open

Hello. It is possible that the door actuator is stuck in the lock position, causing the passenger door to jam. It is also possible that there is a problem with the door latch; if the latch won’t release when the...

Q: Car window not rolling up

I’ll assume you have power windows. If the window is on track and does nothing when you hit the up button, it could be caused by several things. The switch, window motor, or wiring could be faulty and in need...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...