Heater Core Removal and Installation Procedures

Removal

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

Drain the radiator.

Remove the heater water hose.

Squeeze the clamps and pull the hoses off.
Disconnect the vacuum hose from the water control valve.
Remove the instrument panel. Refer to: Body and Frame, Interior Trim, Dashboard/Instrument Panel, Service and Repair, Removal and Installation, See: Body and Frame\Interior Moulding / Trim\Dashboard / Instrument Panel\Service and Repair
Remove the A/C evaporator core housing.
Remove the powertrain control module (PCM).

Remove the PCM heat sink.

Remove the ground strap screw.
Remove the heat sink.

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

Remove the heater core.

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

Remove the heater core.

Installation

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

To install, reverse the removal procedure.

Answered by ASEMaster6371 (expert)
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