Lexus GS300/400 (2000 year). Service manual — part 20
AC0XO–01
I03742
–
AIR CONDITIONING
PRESSURE SWITCH
AC–77
2762
REMOVAL
1.
DISCHARGE REFRIGERANT FROM REFRIGERATION
SYSTEM
HINT:
At the time of installation, please refer to the following item.
Evacuate air from refrigeration system.
Charge system with refrigerant and inspect for leakage of refrig-
erant.
Specified amount: 600
±
50 g (21.16
±
1.76 oz.)
2.
REMOVE PRESSURE SWITCH FROM LIQUID TUBE
Disconnect the connector and remove the pressure switch.
Torque: 10 N·m (100 kgf·cm, 7 ft·lbf)
HINT:
Lock the switch mount on the tube with an open end
wrench, being careful not to deform the tube, and remove
the switch.
At the time of installation, please refer to the following
item.
Lubricate a new O–ring with compressor oil and install the
switch.
AC0XP–01
AC–78
–
AIR CONDITIONING
PRESSURE SWITCH
2763
INSTALLATION
Installtion is in the reverse order of removal (See page
).
Z19533
3
2
1
5
4
1
4
3
2
5
AC0XQ–01
I05027
1
2
5
1
2
3
5
3
N23635
3
2
1
5
4
–
AIR CONDITIONING
RELAY
AC–79
2764
RELAY
INSPECTION
1.
INSPECT HEATER MAIN RELAY
(Marking: HTR) CONTINUITY
Condition
Tester connection
Specified condition
Constant
2 – 4
1 – 3
Continuity
Apply B+ between
terminals 1 and 3.
5 – 4
Continuity
If continuity is not as specified, replace the relay.
2.
INSPECT MAGNETIC CLUTCH RELAY
(Marking: A/C COMP) CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
3.
INSPECT No.2 COOLING FAN RELAY
(Marking: FAN NO.2) CONTINUITY
Condition
Tester connection
Specified condition
Constant
1 – 2
3 – 4
Continuity
Apply B+ between
terminals 1 and 2.
3 – 5
Continuity
If continuity is not as specified, replace the relay.
4.
INSPECT No.3 COOLING FAN RELAY
(Marking: FAN NO.3) CONTINUITY
Check the relay in the same way as for ”MAGNETIC CLUTCH
RELAY”.
AC0Y2–01
I03743
1
2
AC–80
–
AIR CONDITIONING
CONDENSER FAN
2765
CONDENSER FAN
ON–VEHICLE INSPECTION
1.
INSPECT CONDENSER FAN OPERATION
Inspect the fan operation, as shown in the chart below.
Test conditions:
Ignition switch ON
Blower speed control switch position ”HI”
Temperature control dial at ”MAX. COOL”
Install manifold gauge set”
A/C switch ON
Condition
Fan operation (Fan speed)
Engine coolant temperature
91
°
C (196
°
F) or below
Rotate (Low speed)
Engine coolant temperature
100
°
C (212
°
F) or above
Rotate (High speed)
Refrigerant pressure is less than
1,520 kPa (15.5 kgf·cm
2
, 220 psi)
Rotate (Low speed)
Refrigerant pressure is 1,520 kPa
(15.5 kgf·cm
2
, 220 psi) or above
Rotate (High speed)
If operation is not as specified, proceed to the next inspection.
2.
INSPECT CONDENSER FAN MOTOR OPERATION
(a)
Disconnect the fan connector.
(b)
Connect the positive (+) lead from the battery to terminal
2 and negative (–) lead to terminal 1 then check that motor
operations smoothly.
If operation is not as specified, replace the fan mo-
tor.
If operation is as specified, check the pressure
switch, cooling fan relays and engine coolant temp.
switch.
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