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12-03-2008, 09:06 PM | #1 | |
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Loud Clicking Noise When Rear A/C is on
I Have a 2002 Trailblazer and when i turn on the rear A/C there is a loud clicking sound coming from the back of the truck. It is on the passenger side up by the interior light in the third row. If i turn off the Rear A/C or turn the knob and have both the overhead and the feet blow out it does not click.
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08-04-2015, 03:58 PM | #2 | |
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Location: Farmersville, Texas
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Re: Loud Clicking Noise When Rear A/C is on
Anyone have any idea what causes (or solves) this problem? My GF is having the same issue with her 2004 TB EXT. When she first starts up, it makes a loud noise in upper, pass side, rear of cabin. Like up in roof liner, or rear A/C ductwork. It is a rhythmic, whap-whap-whapping sound, about 1x per second. About a block later, it either quits, or doubles in speed, to twice per second, then eventually stops. Next trip, same thing.
Tried messing with the different HVAC controls for front & rear, doesn't seem to affect it. Have searched the boards, this was the only thread I could find that sounded like same problem.
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-Jim 2015 Silverado Crew Cab 2500HD 6.6 Duramax 4x4 2002 Silverado Crewcab HD 2500 6.0 4x4 Sold 281K Great Truck 1970 Chevelle SS454 (Gave to my son 9 years ago for his 18th birthday. Yeah, I know, crazy, right? Thank goodness he doesn't drive it the way I would, -er, did...). 1971 Monte Carlo SS454 Drag Racer. The old girl finally got new paint! 1968 Camaro SS (New race car project). Caged, Tubbed, Back-Half/Ladder Bars. Rolling Chassis (For now). |
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08-04-2015, 06:02 PM | #3 | |
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Re: Loud Clicking Noise When Rear A/C is on
Jim, sounds like a mode door actuator similar to what can occur in the front temp door actuators.
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Last edited by maxwedge; 08-05-2015 at 06:42 PM. |
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08-05-2015, 04:04 PM | #4 | |
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Re: Loud Clicking Noise When Rear A/C is on
Agree, rear a/c mode door actuator keeps running and can't find a "park" position so the door keeps flapping. Pretty common on gm's and fords. Replace the actuator and all should be good.
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