Q: Clicking when A/C is on

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My car is having a clicking sound when the A/C is turned on. I'm not sure what it is or how to fix it.

My car has 39675 miles.
My car has an automatic transmission.

The temperature or mode a/c doors in the dash heater air conditioner doors have electronic actuators that when they go bad may start to click when the a/c is turned on or when trying to change door position that has the defective actuator.

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