GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 872950  Size: SH
  1. Drain the cooling system. Refer to Engine Coolant Check and Replacement .
  2. Remove the windshield washer bottle.

  3. Object Number: 872955  Size: SH
  4. Remove the clamp and thermostat hose from the end of the heater return pipe.
  5. Caution: Ensure that the vehicle is properly supported and squarely positioned. To help avoid personal injury when a vehicle is on a hoist, provide additional support for the vehicle on the opposite end from which the components are being removed.

  6. Raise the vehicle.

  7. Object Number: 872964  Size: SH

    Caution: Protect skin and eyes from coolant that may be left in the pipe and hose. Wear safety goggles.

  8. Remove the clamp and heater hose from the cylinder block near the thermostat housing.

Installation Procedure


    Object Number: 872964  Size: SH
  1. Install the heater hose and clamp to the cylinder block near the thermostat housing. Position the clamp at 6 o'clock.
  2. Lower the vehicle.

  3. Object Number: 872955  Size: SH
  4. Install the hose and clamp to the heater return pipe. Position the clamp at 1 o'clock.
  5. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 872972  Size: SH
  6. Install the windshield washer bottle.
  7. Tighten
    Tightenthe washer bottle attachment bolts to 4 N·m (35 lb in).

  8. Fill the cooling system and leak check. Refer to Engine Coolant Check and Replacement .
  9. Install and tighten the coolant surge tank cap.