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how do i replace the serpentine belt on a 2004 pontiac gran prix

Alan Calder, here is a good guide. The service manual says “DRIVE BELT REPLACEMENT Removal Procedure

  1. Raise and support the vehicle. Refer to LIFTING AND JACKING THE VEHICLE in General Information.
  2. Remove the front fender liner. Refer to FRONT FENDER LINER REPLACEMENT .
  3. Rotate the drive belt tensioner counterclockwise to release the spring tension.
  4. Remove the drive belt.