Heater Core: Service and Repair

HEATER CORE






REMOVE OR DISCONNECT

1. Hose pipe clamp bolt/screw (45) and hose pipe clamp (44). Clamp off heater hoses.

NOTICE: Heater core can be damaged if too much force is applied to heater core pipes during hose removal.

2. Heater hose assembly from heater core pipes.
3. Open instrument panel compartment. Push in on sides of compartment to release it to reach heater core.
4. Heater module bolts/screws (41).
5. Heater module assembly cover.
^ For vehicles equipped with A/C, remove air conditioning evaporator temperature sensor assembly from heater and air conditioning cover and remove air inlet valve actuator.
6. Heater core bolt/screw (42) and heater core clamp (43).
7. Heater core (14).
^ Carefully pull heater core toward you.

INSTALL OR CONNECT

1. Heater core (14).

IMPORTANT
^ Lubricate heater pipes for good seal.
^ Be sure seals around heater pipes remain in place when installing.
^ To verify that seal is installed correctly, observe seal from inside engine compartment. If seal leaks, apply sealer GM P/N 3012078 between heater core pipes and evaporator housing.

2. Heater core bolt/screw (42) and heater core clamp (43).

TIGHTEN
^ Heater core bolt/screw to 1.8 Nm (16 lb in).

3. Hose pipe clamp bolt/screw (45) and hose pipe clamp (44).
^ Unclamp heater hoses.

TIGHTEN
^ Hose pipe clamp bolt screw (45) to 1.8 Nm (16 lb in).

4. Heater hose assembly to heater core pipes.
5. Heater module assembly cover.
6. Heater module bolts/screws (41).

TIGHTEN
^ Heater module bolts/screws (41) to 2 Nm (18 lb in).
^ For vehicles with air conditioning, install air conditioning evaporator temperature sensor to heater core cover and install air inlet valve actuator.

7. Coolant.
A. Fill cooling system.
B. Operate engine and check for leaks at heater core pipes.
C. Check coolant level after engine has been warmed up. Add coolant as necessary.

8. Instrument panel compartment.