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Drive Belt Tensioner Diagnosis

WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Drive Belt Tensioner
    GM657564Courtesy of GENERAL MOTORS CORP.
    CAUTION: Allowing the drive belt tensioner to snap into the free position may result in damage to the tensioner.
    NOTE: When the engine is operating the drive belt tensioner arm will move. Do not replace the drive belt tensioner because of movement in the drive belt tensioner arm.
  1. Remove the drive belt. Refer to Drive Belt Replacement .
  2. Position a 3/8-inch drive breaker bar into the drive belt tensioner opening and rotate the tensioner counterclockwise.
  3. Move the drive belt tensioner through its full travel.
    • The movement should feel smooth
    • There should be no binding
    • The tensioner should return freely
  4. If any binding is observed, replace the drive belt tensioner. Refer to Drive Belt Tensioner Replacement .
  5. Install the drive belt. Refer to Drive Belt Replacement .
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