94 Sierra, Knocks @ Start & Stop

By bguth
November 17, 2009 in 1999-2013 Silverado 1500 & Sierra 1500

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bguth

Posted November 17, 2009

i have 94 gmc sierra 1500 that knocks on the passenger side of the truck @ start-up & shut-down. Is it the recirc. door actuator and is it hard to replace?

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- Hot air constantly blowing through floor vents, drivers side only?
  
  By davester · Posted 4 hours ago
  
  And there aren't any "bellows". There are solid plastic doors the actuators move, which largely seal just by themselves, and then have a strip of foam around the edge to better seal the door. The foam does deteriorate over time, but this is unlikely to be a significant cause of the problem.
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  By davester · Posted 4 hours ago
  
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