GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 TopKick C-Series (Conventional) C6/C7/C8 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Heater Water Valve Replacement

Special Tools

J 39529 Heater Hose Pliers

Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling.
  2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle.

    3. Object Number: 791377 Size: SH
  3. Remove the hose clamps from the heater water shut off valve inlet and outlet using the J 39529 .
  4. Disconnect the heater water shut off valve vacuum hose.
  5. Remove the heater water shut off valve retaining nut (4).
  6. Remove the heater water shut off valve (5).

Installation Procedure

    Object Number: 791377 Size: SH
  1. Install the heater water shut off valve (5).

    2. Caution: Refer to Fastener Caution in the Preface section.

  2. Install the heater water shut off valve retaining nut (4).

    3. Tighten
    Tighten the to 11 N·m (97 lb in).

  3. Connect the heater water shut off valve vacuum hose.
  4. Install the hose clamps to the heater water shut off valve inlet and outlet using the J 39529 .
  5. Lower the vehicle. Refer to Lifting and Jacking the Vehicle.
  6. Fill the engine coolant. Refer to Cooling System Draining and Filling.