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.

A: Hi, thanks for writing in. If your heat is ...

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

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: AC not cooling

There is a wide variety of reasons as to why a vehicle's air conditioning system may not be working properly. The problem can range from the need to add a bit of refrigerant, to the need for a replacement compressor...

Q: A.c. not turning on at all

The blower control blend door actuator on the evaporator case may be bad. Have the blend door actuator removed to see if the blend door can be turned by hand. Sometimes, the actuator breaks and other times, the blend door...

Q: Bank 1 and Bank 2 running lean

If lean faults occur after the manifold was removed and reinstalled, this indicates a vacuum leak which also means that unmetered air is coming into the intake. Either a vacuum line or induction pipe is loose, or the manifold is...

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.