Except L-M/Z Heater Only

HEATER A/C UNIT OVERHAUL (Except L-M/Z Heater Only)
The following operations require the removal of the heater A/C unit housing from the vehicle.
Disassembly
(1) Place the heater A/C unit on a suitable work surface.






(2) Locate and remove one, 1/4-20 retaining nut from the blend-air door pivot shaft.
(3) Using a common pair of pliers, place one plier jaw on top of pivot shaft and the other jaw under the crank linkage and pinch the crank off of the pivot shaft.






(4) Disconnect the vacuum lines from the defrost and panel mode vacuum actuators and position them out of the way.
(5) Remove three heater A/C unit cover attaching screws going upward at the defroster outlet chamber.
(6) Remove two heater A/C unit cover attaching screws going upward at the air inlet plenum.
(7) Remove eleven heater A/C unit cover attaching screws going downward into the housing and lift the cover from the heater A/C unit.






To reassemble, while setting the heater A/C unit cover into place guide the panel air mode door pivot shaft into its socket and reverse the preceding operation.






BLEND-AIR DOOR
Removal and Installation

(1) Remove heater A/C unit top cover
(2) Remove one 1/4-20 nut from bottom of the blend-air door pivot shaft and lift the blend-air door from the heater A/C unit housing.
To reinstall reverse the preceding operation.

HEATER CORE
Removal and Installation
(1) Remove heater A/C unit top cover.
(2) Remove heater core to dash panel seal from the core tubes and remove the heater core from the unit.
To reinstall reverse the preceding operation.

EVAPORATOR COIL
Removal and Installation
(1) Remove heater A/C unit top cover.
(2) Remove the expansion valve sealing plate seal and seal retaining screw from under sealing plate.
(3) Lift the evaporator coil from the heater A/C unit.






To reinstall reverse the preceding operation.

BLOWER MOTOR SUB-ASSEMBLY
Removal and Installation
(1) Using a pair of common pliers, remove the spring type retaining ring from the center of the blower wheel.






(2) Slip blower from blower motor shaft.
To reinstall, reverse the preceding operation.