The blower motor resistor cannot be repaired and,
if faulty or damaged, it must be replaced.
BLOWER MOTOR SWITCH
FRONT
DESCRIPTION
The heater-A/C blower motor is controlled by a four
position rotary-type blower motor switch, mounted in
the heater-A/C control panel. The switch allows the
selection of one of four blower motor speeds, but can
only be turned off by selecting the Off position with
the heater-A/C mode control switch knob.
OPERATION
The blower motor switch directs the blower motor
ground path through the mode control switch to the
blower motor resistor, or directly to ground through
the high speed blower motor relay, as required to
achieve the selected blower motor speed.
The blower motor switch cannot be repaired and, if
faulty or damaged, the entire heater-A/C control unit
must be replaced. The blower motor switch knob is
serviced separately.
REAR
DESCRIPTION
The optional rear overhead A/C unit blower motor
is controlled by a four position rotary-type blower
motor switch, mounted by a snap fit in a hole in the
headliner over the right front seat back. The switch
allows the selection of one of three blower motor
speeds and an Off position. The blower motor switch
directs the blower motor ground path through the
blower motor resistor.
OPERATION
The blower motor switch cannot be repaired and, if
faulty or damaged, the entire switch unit must be
replaced. The blower motor switch has a replaceable
incandescent-type illumination lamp bulb.
COMPRESSOR
DESCRIPTION
The air conditioning system uses a Sanden
SD7H15 seven cylinder, reciprocating wobble plate-
type compressor on all models. This compressor has a
fixed displacement of 150 cubic centimeters (9.375
cubic inches), and has both the suction and discharge
ports located on the cylinder head. A label identifying
the use of R-134a refrigerant is located on the com-
pressor.
OPERATION
The compressor is driven by the engine through an
electric clutch, drive pulley and belt arrangement.
The compressor is lubricated by refrigerant oil that is
circulated throughout the refrigerant system with the
refrigerant.
The compressor draws in low-pressure refrigerant
vapor from the evaporator through its suction port. It
then compresses the refrigerant into a high-pressure,
high-temperature refrigerant vapor, which is then
pumped to the condenser through the compressor dis-
charge port.
The compressor cannot be repaired. If faulty or
damaged, the entire compressor assembly must be
replaced. The compressor clutch, pulley and clutch
coil are available for service.
COMPRESSOR CLUTCH
DESCRIPTION
The compressor clutch assembly consists of a sta-
tionary electromagnetic coil, a hub bearing and pul-
ley assembly, and a clutch plate (Fig. 3). The
electromagnetic coil unit and the hub bearing and
pulley assembly are each retained on the nose of the
compressor front housing with snap rings. The clutch
plate is mounted to the compressor shaft and secured
with a nut.
OPERATION
These components provide the means to engage
and disengage the compressor from the engine ser-
pentine accessory drive belt. When the clutch coil is
Fig. 3 Compressor Clutch - Typical
1 – CLUTCH PLATE
2 – SHAFT KEY
3 – PULLEY
4 – COIL
5 – CLUTCH SHIMS
6 – SNAP RING
7 – SNAP RING
24 - 4 HEATING AND AIR CONDITIONING DN
DESCRIPTION AND OPERATION (Continued)
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