GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Engine 🢒 Engine Cooling 🢒 Heater Core Replacement

Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. Remove the I/P compartment door hinge screws.
  3. Remove the I/P compartment door.
  4. Remove the heater core tube clamp bolt.
  5. Remove the heater core tube clamp.

    6. Notice: Do not apply excessive force on the heater core pipes during hose removal. Applying excessive force on the heater core pipes may damage the heater core pipes.

  6. Remove the heater hoses from the heater core pipes.
  7. Remove the heater module screws.
  8. Remove the heater module cover.
  9. Remove the heater core clamp bolt.
  10. Remove the heater core clamp.
  11. Carefully pull the heater core toward you.

    12. Remove the heater core.

Installation Procedure
  1. Install the heater core.
  2. Install the heater core clamp.
  3. Install the heater core clamp bolt.

    4. Tighten
    Tighten the heater core clamp bolt to 1.8 N·m (16 lb in).

  4. Install the heater module cover.
  5. Install the heater module screws.

    6. Tighten
    Tighten the heater module screws to 1.8 N·m (16 lb in).

  6. Install the heater hose to the heater core pipes.
  7. Remove the heater core tube clamp.
  8. Remove the heater core tube clamp bolt.

    9. Tighten
    Tighten the heater core tube clamp bolt to 2 N·m (18 lb in).

  9. Remove the I/P compartment door.
  10. Remove the I/P compartment door hinge screws.
  11. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.