GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 38185 Hose Clamp Pliers

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling .
  2. Remove the vacuum control solenoid valve. Refer to Secondary Air Injection Vacuum Control Solenoid Valve Replacement in Engine Controls 4.6 L.
  3. Disconnect the heater hoses from the heater inlet pipe (1) using the J 38185 .

  4. Object Number: 780218  Size: SH
  5. Remove the heater pipe clamp bolts (1).

  6. Object Number: 780169  Size: SH
  7. Remove the heater pipe clamp bolt (4).
  8. Disconnect the heater hose (3) from the heater inlet pipe.
  9. Remove the heater hose.

Installation Procedure

  1. Install the heater pipe (1) into position.

  2. Object Number: 608980  Size: SH
  3. Connect the heater hoses to the heater inlet pipe using the J 38185 .

  4. Object Number: 780169  Size: SH
  5. Install the bracket bolts (1).
  6. Install the bracket and bolt (4).
  7. Connect the heater hoses.
  8. Install the vacuum control solenoid valve. Refer to Secondary Air Injection Vacuum Control Solenoid Valve Replacement in Engine Controls 4.6 L.
  9. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.