1995 JEEP YJ Service And Repair Manual

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Page 2097 of 2158

JEEP YJ 1995 Service And Repair Manual (6) Test A/C blower switch HIGH terminal with
blower switch in HIGH, should be battery voltage. If
not, replace switch.
BLOWER MOTOR
The A/C blower motor is attached to the evaporator
housing mounted

(6) Test A/C blower switch HIGH terminal with
blower switch in HIGH, should be battery voltage. If
not, replace switch.
BLOWER MOTOR
The A/C blower motor is attached to the evaporator
housing mounted under the instrument panel. The
motor has a ground wire and 3 wires connect to the
motor brushes. When voltage is applied to the sepa-
rate brushes it provides the 3 blower speeds LO,
MED, and HIGH.
BLOWER MOTOR TEST
Turn ignition switch to RUN for voltage tests and
turn ignition switch to OFF for resistance test.
(1) Test A/C blower motor ground terminal should
be 0 ohms. If not, repair ground circuit.
(2) Test A/C blower motor connector LO terminal
with blower switch in LO, should be battery voltage.
If not repair open from blower switch. If the blower
motor is still inoperative replace motor.
(3) Test A/C blower motor connector MED terminal
with blower switch in MED, should be battery volt-
age. If not repair open from blower switch. If the
blower motor is still inoperative replace motor.
(4) Test A/C blower motor connector HIGH termi-
nal with blower switch in HIGH, should be battery
voltage. If not, repair open from blower switch. If the
blower motor is still inoperative, replace motor.
HEATER DIAGNOSIS
On LHD XJ vehicles a water valve controls coolant
flow to the heater core. The valve is vacuum oper-
ated. When vacuum is applied, the valve opens and
coolant is directed through the heater core and back
to the engine. When the water valve is closed (no
vacuum applied) coolant flow bypasses the heater
core back to the engine.
The heating system receives its battery feed from
the fuse box. On YJ vehicles the feed circuit runs to
the HEATER/OFF switch and then to the BLOWER
switch. On XJ vehicles the feed circuit runs to the
HEAT/MODE switch and then to the BLOWER
switch.
The blower speed is controlled by the blower switch
and blower resistors. With the switch in LO, battery
voltage is supplied to the motor through all of the re-
sistors. The motor runs slowly. When the blower
switch is moved to a higher speed, battery voltage in-
creases to the blower motor which increase its speed.
This is accomplished by bypassing some of the blower
resistors. When the switch is in HI, blower resistors
are bypassed and battery voltage is applied directly
to the blower motor.
The following chart has been developed for quick
reference.
Refer to the Group 8W Wiring Diagrams for com-
plete wiring schematic.
JHEATING AND AIR CONDITIONING 24 - 17

Page 2098 of 2158

JEEP YJ 1995 Service And Repair Manual HEATING SYSTEM DIAGNOSIS
24 - 18 HEATING AND AIR CONDITIONINGJ

Page 2099 of 2158

JEEP YJ 1995 Service And Repair Manual COMPRESSOR SERVICE
DESCRIPTION
The A/C system uses a Sanden SD7H15 compres-
sor. The compressor is a 7 piston design.
The clutch used on the compressor consists of 3 ba-
sic components: the pulley and

COMPRESSOR SERVICE
DESCRIPTION
The A/C system uses a Sanden SD7H15 compres-
sor. The compressor is a 7 piston design.
The clutch used on the compressor consists of 3 ba-
sic components: the pulley and bearing hub, clutch
plate and field coil (Fig. 1). The pulley and field coil
are attached to the front of the compressor with ta-
pered snap rings. The compressor has a splined shaft
and the clutch plate is retained on the shaft with a
self-locking nut.
COMPRESSOR
REVIEW WARNINGS AND CAUTIONS IN
THIS GROUP BEFORE PROCEEDING WITH
THIS PROCEDURE.
REMOVAL
(1) Recover refrigerant from A/C system.
(2) Disconnect negative cable from battery.
(3) Disconnect the clutch lead wire.
(4) Remove the discharge and suction lines from
the compressor. Plug or tape all the openings.
(5) Remove the serpentine drive belt (refer to
Group 7, Cooling System for the proper procedure).
(6) Remove the bolts and lift the compressor from
the mounting bracket (Figs. 2 and 3).
INSTALLATION
If a replacement compressor is being in-
stalled; check the oil level. Add or subtract oil
as necessary and install the magnetic clutch on
the compressor.
(1) If the mounting bracket was removed, install
the bracket to the block. Tighten the mounting bolts
to 27 Nzm (20 ft. lbs.) torque.
(2) Install the compressor on the mounting
bracket. Tighten the bolts to 27 Nzm (20 ft. lbs.)
torque.(3) Install the serpentine drive belt (refer to Group
7, Cooling System for the proper procedure).
(4) Tighten the serpentine drive belt to the speci-
fied tension.
²New belt tensionÐ800-900 N (180-200 lb-f).
²Used belt tensionÐ623-712 N (140-160 lb-f).
(5) Remove the tape or plastic plugs from all the
suction and discharge openings and install lines on
the compressor.
(6) Connect the clutch lead wire.
(7) Connect negative cable to battery.
(8) Evacuate, charge and test the system for leaks.
Fig. 1 Compressor Clutch
Fig. 2 Compressor and Mounting Bracket (LH Drive
Vehicles)
Fig. 3 Compressor and Mounting Bracket (RH Drive
Vehicles)
JHEATING AND AIR CONDITIONING 24 - 19

Page 2100 of 2158

JEEP YJ 1995 Service And Repair Manual COMPRESSOR CLUTCH ASSEMBLY
The compressor clutch can be serviced in the vehi-
cle.
REMOVAL
(1) Remove the serpentine drive belt (refer to
Group 7, Cooling System for the proper procedure).
(2) Remove

Page 2101 of 2158

JEEP YJ 1995 Service And Repair Manual (9) Remove the screw and retainer from coil lead
wire on compressor front housing (Fig. 9).
(10) Remove snap ring from compressor hub and
remove field coil (Fig. 10).INSTALLATION
(1) Install field coi

Page 2102 of 2158

JEEP YJ 1995 Service And Repair Manual (8) Check air gap with feeler gauge (Fig. 13). If the
air gap does not meet the specification add or sub-
tract shims as required. The specification is 0.41-0.79
mm (0.016-0.031 inch). If air gap is n

Page 2103 of 2158

JEEP YJ 1995 Service And Repair Manual COMPONENT SERVICEÐXJ VEHICLES
INDEX
page page
A/C Recirculating Door Vacuum Motor
Replacement........................... 27
Blower Motor Resistors Replacement.......... 31
Blower Motor/Fan Replacemen

Page 2104 of 2158

JEEP YJ 1995 Service And Repair Manual (5) Remove the A/C-heater control panel screws
(Fig. 4).
(6) Remove the electrical connectors (Fig. 5).
(7) Disconnect the vacuum hoses by releasing the
locking tabs (Fig. 6).
(8) Remove the control c

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