HVAC Noise while using the AC

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Ratchet Thunderbolt, Aug 29, 2009.

  1. Ratchet Thunderbolt

    Ratchet Thunderbolt New Member

    I have a new 09 Silverado. Running the AC on high when I first get in the truck it sounds normal. After about 30 minutes of driving with the ac if I turn the blower back on high it has a very noticeable buffeting noise. I've checked the evaporator drain and it's clear, thought it could have been a build up of water. This happens with recirculate or outside air. Let it sit awhile and it's back to normal fan noise. Ideas? Thanks.

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