Q: AC tapping noise when on recirculation.

asked by on

I have had a recurring problem with A/C blower only working on four. I know that is due to a bad blower resistor and/ or cable. This problem goes back years. I push the buttons repeatedly or wiggle the cable and it temporarily fixes it for a few minutes or weeks. New problem is a loud tapping when a /c in recirculate mode. Takes about 5 seconds after engaging recirculation. I can put in recirc and change from dash outlet to lower heater or defrost or defrost combo and no tapping. When normal dash has to be in fresh air mode, otherwise tapping.

My car has 80000 miles.
My car has an automatic transmission.

Hey there. The tapping noise you are hearing is most likely the air circulation door actuator. There is a separate actuator for the mode door position. The mode door directs the air out the various vents on your dash and the recirculation door opens and closes a door to fresh air from the outside of your car. The noise you are hearing is very common across all manufacturers. The internal gears of the actuator are broken at the end of its travel. Eventually, this will lead to a complete failure of the actuator. If you would like a precise diagnosis of this, a certified technician, like one from YourMechanic, can inspect the tapping noise in person and proceed with repairs.

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. AC tapping noise when on recirculation.

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: First gear shifting issues - 1999 Isuzu Amigo

Hello. If your vehicle is experiencing shifting issues and has not had the transmission serviced after nearly 100k miles, it may very well be time for a service. Automatic transmissions operate using the fluid pressure to shift automatically. If the...

Q: Car not running

It sounds like you have at least two issues, the check engine light has come on accompanied by loss of power and you have an antifreeze leak. The source of antifreeze leaks can be pinpointed by simple pressure testing of...

Q: Check Engine light revealed thermostat problem

Sounds like you have a code P0128. The computer monitors the warm up cycle of your engine -- it looks for your coolant temperature to rise to a certain level within a given time frame. The computer does this...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.