Heater Core: Service and Repair

REMOVAL






WARNING: HOT ENGINE COOLANT CAN CAUSE SEVERE BURNS. DO NOT OPEN THE RADIATOR DRAIN COCK WHEN THE COOLING SYSTEM IS HOT AND PRESSURIZED. ALLOW THE COOLANT TO DECREASE TO ROOM TEMPERATURE BEFORE STARTING REPAIR OPERATIONS.

1. Drain approximately 1.9 liters (2 qts) of coolant from the radiator, Drain the coolant into a clean container.

2. Disconnect the heater hoses.

3. Disconnect the vent door cables.

4. Disconnect the blower motor wire.

5. Disconnect the defroster duct.

6. Remove the nuts that attach the heater housing studs to the engine compartment side of the dash panel.

7. Remove the heater housing assembly by tilting it downward, to disengage it from the' defroster duct. Pull it rearward and out from under the instrument panel.

8. Remove the heater housing cover from the housing.

9. Remove the heater core from the housing.

INSTALLATION

1. Install the heater core in the housing and install the cover on the housing.

2. Position the heater housing on the dash panel. Be sure the housing studs all extend through the dash panel.

3. Install the seals on the heater core outlet and inlet tubes and over the blower motor housing.

4. Install the attaching nuts on the housing studs.

CAUTION: DO NOT over tighten the attaching nuts. The housing could become distorted causing air leaks and improper heater door operation. Tighten the nuts alternately and evenly until 2 stud threads are visible beyond each nut.

5. Connect the defroster duct to the housing.

6. Connect the blower motor wire.

7. Connect the vent door control cables.

8. Connect the heater hoses.

9. Fill and bleed the cooling system.

10. Check system operation.