GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Release the hose clamps.
  3. Remove the heater core inlet hose at the bulkhead and at the rear of the cylinder head.

  4. Object Number: 488782  Size: SH
  5. Remove the heater core outlet hose at the bulkhead and at the rear of the cylinder block on 2.0L equipped vehicles.
  6. Remove the heater core outlet hose at the bulkhead and at the side of the cylinder block on 1.6L equipped vehicles.

Installation Procedure


    Object Number: 488782  Size: SH
  1. Install the heater core inlet hose at the bulkhead and at the rear of the cylinder head.
  2. Secure the heater core inlet hose with the hose clamps.
  3. Install the heater core outlet hose at the bulkhead and at the rear of the cylinder block on 2.0L equipped vehicles.
  4. Install the heater core outlet hose at the bulkhead and at the side of the cylinder block on 1.6L equipped vehicles.
  5. Secure the heater core outlet hose with the hose clamps.
  6. Fill the engine cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.