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24 - 2
HEATING AND AIR CONDITIONING
DESCRIPTION AND OPERATION
ACCUMULATOR
DESCRIPTION
The accumulator is mounted in the engine com-
partment between the evaporator coil outlet tube and
the compressor inlet.
OPERATION
Refrigerant enters the accumulator canister as a
low pressure vapor through the inlet tube. Any liq-
uid, oil-laden refrigerant falls to the bottom of the
canister, which acts as a separator. A desiccant bag is
mounted inside the accumulator canister to absorb
any moisture which may have entered and become
trapped within the refrigerant system (Fig. 1).
Fig. 1 Accumulator - Typical
1 – LOW PRESSURE CYCLING CLUTCH SWITCH
2 – PRESSURE SWITCH FITTING
3 – OUTLET TO COMPRESSOR
4 – ANTI-SIPHON HOLE
5 – DESICCANT BAG
6 – OIL RETURN ORIFICE FILTER
7 – VAPOR RETURN TUBE
8 – ACCUMULATOR DOME
9 – O-RING SEAL
10 – INLET FROM EVAPORATOR
BLOWER MOTOR
DESCRIPTION
The blower motor and blower wheel are located in
the passenger side end of the heater-A/C housing,
below the glove box. The blower motor controls the
velocity of air flowing through the heater-A/C hous-
ing by spinning a squirrel cage-type blower wheel
within the housing at the selected speed. The blower
motor and wheel can be removed through an opening
in the engine compartment side of the dash panel
without heater-A/C housing removal.
OPERATION
The blower motor will only operate when the igni-
tion switch is in the On position, and the heater-A/C
mode control switch knob is in any position, except
Off. The blower motor receives a fused battery feed
through the blower motor relay whenever the igni-
tion switch is in the On position. The blower motor
battery feed circuit is protected by a fuse in the
Power Distribution Center (PDC). Blower motor
speed is controlled by regulating the ground path
through the heater-A/C control blower motor switch
and the blower motor resistor.
The blower motor and blower motor wheel cannot
be repaired and, if faulty or damaged, they must be
replaced. The blower motor and blower wheel are ser-
viced only as a unit.
BLOWER MOTOR RELAY
DESCRIPTION
The blower motor relay is a International Stan-
dards Organization (ISO)-type relay. The relay is a
electromechanical device that switches battery cur-
rent from a fuse in the Power Distribution Center
(PDC) directly to the blower motor. The relay is ener-
gized when the relay coil is provided a voltage signal
by the ignition switch. See Blower Motor Relay in the
Diagnosis and Testing section of this group for more
information.
OPERATION
The blower motor relay is installed in a wire har-
ness connector that is secured to the passenger side
outboard end of the heater-A/C housing in the pas-
senger compartment, next to the heater-A/C wire
harness connector.
The blower motor relay cannot be repaired and, if
faulty or damaged, it must be replaced.
XJ
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