Mechanics

WHAT AUSES THE A/C MAKE A LOUD HUMMING SOUND ONLY ON HIGH SPEED

2002 Pontiac Firebird • 77,000 miles

A/c set at coldest has 4 speeds no noise but just on 4th speed
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Billmill5050
May 20, 2012.



1 more


Tiny
Billmill5050
Jul 13, 2012.
Where did you get your diagrams at?


Tiny
Billmill5050
Jul 13, 2012.
I ran ac it open & closes a door when u go from ac to max ac


Tiny
Billmill5050
Jul 14, 2012.
Thats your recirculation door actuator.
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Saturntech9
Jul 14, 2012.
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