Lexus GS300/400 (2000 year). 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

AC–77

).

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.