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30-4
HEATER
FAN CONTROL SWITCH
Removal
(1) Rotate knob until slot in neck of knob is visible.
Insert a small bladed screwdriver in the slot and depress
spring metal clip toward knob. This will relieve tension
on the spring metal clip and allow knob to slide off shaft
(fig.3D-4).
DEPRESS
TOWARD
HANDLE
60134
Fig. 30-4 Fin Control Knob Locking Feature
(2) Remove retaining nut and trim ring.
(3) Remove switch from instrument panel and dis
connect wires.
Installation
(1) Connect wires
and position switch in
instrument panel.
(2) Install trim ring and retaining nut.
(3) Install control knob.
CONTROL CABLES
Adjustment
The only cable that is adjustable is the cable from the
air inlet linkage to the passenger vent door at the right
side of the heater. This cable has a turnbuckle adjust
ment located approximately six inches above the cable
attachment to the right side of the heater. Adjust this
cable until the passenger vent door is closed when the air
control knob is pushed in.
NOTE: If the cable is adjusted beyond the closed door
position it will cause a bind in the linkage and may
prevent the drivers vent door from closing.
Replacement
(1) Disconnect cable from door and housing.
NOTE: The control cables are retained on the backside
of the instrument panel by plastic tabs. Todisengage the
cables from the instrument panel, press the plastic tabs
together and pull out the cable.
(2) Remove cable from instrument panel.
(3) Remove cable-to-damper door.
(4) Route replacement cable through hole in in
strument panel
(5) Connect cable to door and housing.
(6) Install cable to damper door.
(7) Check operation.
HEATER CORE
The heater housing assembly must be removed to gain
access to the heater core.
Removal
(1) Drain approximately two quarts of coolant from
the radiator.
(2) Disconnect heater hoses.
(3) Disconnect damper door control cables.
(4) Disconnect blower motor wire.
(5) Disconnect water drain hose and defroster hose.
(6) Remove nuts from heater housing studs in en
gine compartment.
(7) Remove heater housing assembly by tilting
down to disengage from air inlet duct and pulling to the
rear of the vehicle.
(8) Remove heater core from heater housing.
Installation
(1) Install heater core in housing.
(2) Position heater core housing and install attach
ing nuts.
NOTE: Make sure that the seals around the core pipes
and blower motor are in position before installing the
heater to the dash panel Do not over-torque the heater
to dash panel nuts as this can cause distortion of the
heater assembly. Tighten until two threads are visible
beyond the nut.
(3) Connect water drain hose and defroster hose.
(4) Connect blower motor wire.
(5) Connectand adjust damper door control cables.
(6) Connect heater hoses.
(7) Replace coolant.
(8) Check heater operation.
BLOWER MOTOR
The heater housing assembly must be removed to
replace the blower motor.
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Troubleshooting
