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原帖由: L Pfaff ,

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Donald,  Found this info. from a Ford F150 forum, There are 4 electric actuators that control temperature (left and right), air recirculation, and mode. Try adjusting the controls one at a time to determine which actuator has failed. You may have to do a little investigative work to find which one is making the noise. Each has a small motor with a potentiometer that lets the control module determine where the particular door is positioned. When they fail, usually the module can't tell the position of the actuator and runs its motor looking for its signal. When it gets to the end of the gear it goes "pop - pop - pop".

Links below show/explain how to change actuator in your truck. Good luck.

I hope this helped you out, if so let me know by pressing the helpful button.

https://www.youtube.com/watch?v=D-M30Kyyykc

https://www.youtube.com/watch?v=EbTivF3Mp8I

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