GM Service Manual Online
For 1990-2009 cars only
  1. Clean the drive belt tensioner thread.

  2. Object Number: 2027566  Size: SH
  3. Install drive belt tensioner (1).
  4. Caution: Refer to Fastener Caution in the Preface section.

  5. Install drive belt tensioner bolt (2) and tighten to  50 N·m (37 lb ft).