GM Service Manual Online
For 1990-2009 cars only

    Object Number: 1309968  Size: SH
  1. Install the thermostat (312) with the seal into the engine coolant crossover (308).
  2. Install the water outlet (311).
  3. Notice: Refer to Fastener Notice in the Preface section.

  4. Install the water outlet bolts (310).
  5. Tighten
    Tighten the bolts to 30 N·m (22 lb ft).


    Object Number: 470698  Size: SH
  6. Install the gaskets and the engine coolant crossover.
  7. Install the bolts.
  8. Tighten
    Tighten the engine coolant crossover bolts to 50 N·m (37 lb ft).


    Object Number: 470692  Size: SH

    Important: Properly position the thermostat bypass hose clamps to avoid water pump pulley interference.

  9. Install the thermostat bypass hose and clamps.

  10. Object Number: 470789  Size: SH
  11. Install the drive belt tensioner.
  12. Install the drive belt tensioner bolts.
  13. Tighten
    Tighten the drive belt tensioner bolts to 50 N·m (37 lb ft).