AIR-CONDITIONING-Service Adiustment Procedures 24-31
FREEZE UP CONTROL
Evaporator freeze up is controlled by a thermistor attached to the
evaporator fins. The control is an electronic type and consists of
two parts_(thermo relay and thermistor.) It is connected to the
magnetic clutch of the compressor in series. When the tempera-
ture of the evaporator drops below 3°C (37.4”F), the compressor is
turned OFF.
To Test the Thermistor
(1) Jump the wire lead (LB to GB) of the connector portion.
(2) Press the air conditioner switch and blower switch on.
(3) Momentarily turn the ignition switch on (do not crank the en-
gine), listen for the clutch engaging.
(4) If the clutch does not engage, the low pressure switch,
water temperature switch wiring or fuse may be faulty.
(5) If the clutch operates, replace the thermostat.
WATER TEMPERATURE SWITCH
The water temperature switch is located on the thermostat hous-
ing. The water temperature switch is connected to the clutch
in series. When the coolant temperature in the radiator
reaches above 113°C (235”F), it turns the compressor OFF.
This is to prevent engine overheating.
When the water temperature switch is activated and the clutch is
OFF, check the surface of the condenser and radiator, the belt
tension, and the coolant volume in the radiator, and return to the
normal condition.
To Test the Water Temperature Switch
(1) Remove wire from water temperature switch and jump lead
wires.
(2) Press the air conditioner switch and blower switch on.
(3) Momentarily turn the ignition switch on (do not crank the en-
gine), listen for the clutch engaging.
(4) If the clutch does not-engage, the fin thermistor, low pressure
switch, wiring or fuse may be faulty.
(5) If clutch engages, replace the switch.
1 STB Revision
AIR-CONDITIONING - Receiver drier, Condenser, Compressor Clutch Assembly 24-45
RECEIVER DRIER, CONDESER, COMPRESSOR CLUTCH ASSEMBLY
REMOVAL AND INSTALLATION N24TA--
Pre-removal Operation l Discharge the Refrigerant. (Refer to
P.24-36)
l Remove the Radiator Grille. (Refer
to GROUP 23 BODY-Grille, Garnish,
Moulding)
l Disconnect the Liquid Pipes and
Hoses.
Post-installation Operation
l Install the Radiator Grille. (Refer to
GROUP 23 BODY-Grille, Garnish,
Moulding)
l Charge the Refrigerant. (Refer to
P.24.37)
l Adjustment of the Tension of the
Air Conditioner Drive Belt. (Refer to
P.24-40)
2OW832 Receiver drier removal steps
Compressor clutch assembly removal steps
1. Reveiver drier mounting bolt
8. Drive belt
2. Receiver drier
9. Compressor clutch assembly mounting
Condenser removal steps
3. Blower motor connector
4. Blower motor mounting bolt
5. Blower motor
6. Condenser mounting bolt
7. Condenser bolt
10. Compressor clutch assembly
NOTE
Reverse the removal procedures to reinstall.
SERVICE POINTS OF REMOVAL N24TBAB 1 STB Revision Caution
If the hoses or pipes are disconnected,cap the hoses or pipes
with a blank plug to prevent entry of dust, dirt, and water.
