Lexus GS300/400 (2000 year). Service manual - part 5

AC0WK–01

I02360

I02361

AC–24

–

AIR CONDITIONING

AIR CONDITIONING UNIT

2709

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.

DRAIN ENGINE COOLANT FROM RADIATOR

HINT:
It is not necessary to drain out all coolant.

3.

DISCONNECT LIQUID TUBE AND SUCTION HOSE
FROM A/C UNIT

Remove the bolt and slide the plate, then disconnect the both
tubes.

Torque: 10 N·m (100 kgf·cm, 7 ft·lbf)

NOTICE:
Cap the open fittings immediately to keep moisture or dirt
out of the system.
HINT:
At the time of installation, please refer to the following item.
Lubricate 2 new O–rings with compressor oil and install them
to the tubes.

4.

DISCONNECT WATER HOSES FROM HEATER RA-
DIATOR PIPES

(a)

Grips the claws of the hose clip and slide the hose clip
along the hose.

(b)

Disconnect the water hose.

I02362

I02363

–

AIR CONDITIONING

AIR CONDITIONING UNIT

AC–25

2710

5.

REMOVE THESE PARTS:

(a)

Cooler No.1 grommet

(b)

Heater pipe grommet

(c)

Drain hose grommet

(d)

Instrument panel and reinforcement
(See page 

BO–91

)

(e)

Blower unit
(See page 

AC–30

)

6.

REMOVE 3 AIR DUCTS

(a)

Remove the 2 screws and center air duct.

(b)

Slide the floor carpet backward.

(c)

Disconnect the wire harness clamps.

(d)

Remove the 2 bolts and air ducts LH, RH.

7.

REMOVE A/C UNIT

(a)

Disconnect the connector.

(b)

Remove the wire harness set nut.

(c)

Disconnect the wire harness clamps.

(d)

Remove the 2 nuts, bolt and A/C unit.

AC0WL–01

AC–26

–

AIR CONDITIONING

AIR CONDITIONING UNIT

2711

DISASSEMBLY

1.

REMOVE THESE PARTS:

(a)

Wire harness

(b)

Drain hose

2.

REMOVE HEATER RADIATOR

(a)

Remove the screw and clamp.

(b)

Pull out the heater radiator.

3.

REMOVE BLOWER MOTOR CONTROL RELAY

Remove the screw and blower motor control relay.
4.

REMOVE AIR MIX SERVOMOTORS

Remove the 6 screws and both servomotors.
5.

REMOVE AIR OUTLET SERVOMOTOR

Remove the 2 screws and servomotor.
6.

REMOVE EXPANSION VALVE

(a)

Pry out the packing.

HINT:
At the time of reassembly, please refer to the following item.
Do not reuse the packing.
(b)

Using SST, remove the 2 bolts, then separate the expansion valve, tube connector and tube and ac-
cessory.
SST

07110–61050

Torque: 4.1N·m (42 kgf·cm, 36 in.·lbf)

HINT:
At the time of reassembly, please refer to the following item.
Lubricate 4 new O–rings with compressor oil and install them to the valve.
7.

REMOVE EVAPORATOR TEMPERATURE SENSOR

(a)

Disconnect the wire harness clamp.

(b)

Using a screwdriver, pull out the sensor with bracket plate.

HINT:
Tape the screwdriver tip before use.
(c)

Release the 2 claws and sensor from bracket plate.

8.

REMOVE EVAPORATOR

(a)

Using SST, remove the 2 bolts and tube and accessory.
SST

07110–61050

Torque: 4.1N·m (42 kgf·cm, 36 in.·lbf)

HINT:
At the time of reassembly, please refer to the following item.
Lubricate 2 new O–rings with compressor oil and install them to the tube.
(b)

Remove the 4 screws and cover.

(c)

Pull out the evaporator.

(d)

Remove the plate from evaporator.

HINT:
At the time of reassembly, please refer to the following item.
If evaporator is replaced, add compressor oil to evaporator.

Add 40 cc (1.4fl.oz.)
Compressor oil: ND–OIL 8 or equivalent

9.

REMOVE INSULATOR FROM HEATER CASE

10.

REMOVE AIR DUCT

Remove the 4 screws and duct.

AC0WM–01

–

AIR CONDITIONING

AIR CONDITIONING UNIT

AC–27

2712

REASSEMBLY

Reassembly is in the reverse order of disassembly (See page 

AC–26

).