Heater Core: Service and Repair

REMOVAL
1. Drain the radiator.

NOTE: If a heater core leak is suspected, the heater core must be leak tested before it is removed from the vehicle.






2. Remove the heater water hoses.
1 Squeeze the clamps and pull the hoses off.
2 Disconnect the vacuum hose from the water control valve.
3. Remove the A/C evaporator core housing, please refer to Heating and Air Conditioning/Evaporator Case/Service and Repair/ Service and Repair
4. Remove the dash board. Refer to: Body and Frame, Interior Trim, Dashboard/Instrument Panel, Service and Repair, Removal and Installation, Service and Repair

5. Remove the Powertrain Control Module (PCM), please refer to Powertrain Management/Computers and Control Systems/Engine Control Module/Service and Repair/ Service and Repair






6. Remove the PCM heat sink.
1 Remove the ground strap screw.
2 Remove the heat sink.






7. Remove the heater air plenum nuts from the engine side of the dash panel.






8. Remove the heater core.
1 Remove the heater core cover to air plenum screws.
2 Lift off the cover.






9. Remove the heater core.

INSTALLATION
1. To install, reverse the removal procedure.

NOTE: Be sure to install a new oval foam seal around the heater core inlet and outlet tubes.