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Pickups Chevrolet Silverado & GMC Sierra Chevy Silverado and GMC Sierra Noise and Vibration
172 messages, Last post on Oct 28, 2009 at 1:49 PM
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I am confused, with max AC selected on, I hear what sounds like the engine fan rubbing during heavy acceleration and just coming off the acceleration. Fan tips seem to be worn, but good clearance around fan shroud with engine turned off. I do not witness any severe engine movement during acceleration or deceleration. Noise will occur in "park" or when driving. Water pump changed last year, everything appears normal. Belt tension & wear normal. AC blows cold. I was thinking of the following possible causes: broken motor mount (don't see motor sway), fan clutch, ac compressor, or harmonic balancer. It is difficult to confirm with engine rpm around 2500-2900 rpm on quick accel or decel. Has anyone seen this before or have any input? |
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Replying to: clareance (Aug 31, 2009 5:45 pm) |
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| Have a 09 GMC Sierra. Several months ago started feeling two distinct vibrations coming from the gas pedal shortly after putting it in drive and starting to pull away. After this you won’t feel the vibrations again until the truck has been put into park again and shut off for a few minutes. The speed that I pull away at doesn’t seem to be a factor and it won’t do it in reverse. Been to the shop numerous times and each time they call it “normal operation” except that it didn’t do it when I bought it 6 months ago. Any ideas? | |
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