GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39529 Heater Hose Pliers

Removal Procedure

  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.

  2. Object Number: 301617  Size: SH
  3. Remove the hose clamps from the outlet pipe and the inlet pipe using the J 39529 .

  4. Object Number: 301596  Size: SH
  5. Disconnect the heater inlet pipe and the outlet pipe from the by-pass valve(s).
  6. Remove the by-pass valve (3) from the vehicle.

Installation Procedure


    Object Number: 301596  Size: SH
  1. Install the bypass valve (3) into the vehicle.
  2. Connect the heater inlet pipe and the outlet pipe to the bypass valve(s).

  3. Object Number: 301617  Size: SH
  4. Install the hose clamps using the J 39529 .
  5. Fill the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  6. Verify that the system has no leaks.