Lexus SC300 / Lexus SC400. Service manual - part 37

12.  REMOVE CONNECTOR BRACKET FROM UNDER SIDE

OF BLOWER MOTOR
Remove the two screws and the bracket.

13.  REMOVE A/C UNIT
(a)  Disconnect connectors from the unit.
(b)  Remove the six bolts and the A/C unit.

INSTALLATION OF A/C UNIT

1. INSTALL 

A/C 

UNIT

(a)  Match the standard holes of the A/C unit with those on the

vehicle.
HINT:

•

V
Pull the drain hose of the A/C unit forward until the
yellow paint on the hose is visible in the engine
compartment.

•

V
Insert the drain hose into the engine compartment hose
until the match marks are aligned.

(b)  Tighten six bolts.
2. INSTALL 

CONNECTOR 

BRACKET

3. 

INSTALL HEATER TO RESISTER NO. 3 DUCT

4. 

INSTALL REAR AIR DUCTS

5. 

INSTALL FLOOR CARPET

6. INSTALL 

INSULATOR 

RETAINER

7. 

INSTALL WATER HOSE TO HEATER RADIATOR

8. 

INSTALL BRAKE TUBE BRACKET MOUNTING BOLTS

9. INSTALL 

WATER 

VALVE

See page 

AC–127

AC–108

–

AIR CONDITIONING SYSTEM

Troubleshooting

9. INSTALL 

EVAPORATOR

See page 

AC–124

10.  INSTALL INSTRUMENT PANEL REINFORCEMENT
11. INSTALL 

ENGINE

See page EM–167

12. EVACUATE AIR IN REFRIGERATION SYSTEM AND

CHARGE WITH REFRIGERANT
See page 

AC–17

Specified amount: 950 

±

 50 g (33.44 

±

 1.76 oz)

13.  INSPECT FOR LEAKAGE OF REFRIGERANT

Using a gas leak tester, check for leakage of refrigerant.

–

AIR CONDITIONING SYSTEM

Troubleshooting

AC–109

COMPRESSOR

INSPECTION OF COMPRESSOR
(Magnetic Clutch)

See page 

AC–86

(Compressor)

1. 

INSTALL MANIFOLD GAUGE SET
See page 

AC–15

2. START 

ENGINE

3. 

INSPECT COMPRESSOR FOR METALLIC SOUND
Check that there is metallic sound from the compressor when
the A/C switch is turned on.
If a metallic sound is heard, replace the compressor assem-
bly.

4. 

INSPECT PRESSURE OF REFRIGERATION SYSTEM
See ”Inspection of Refrigeration System with Manifold
Gauge Set” on page.

5. STOP 

ENGINE

6. 

INSPECT VISUALLY FOR LEAKAGE OF REFRIGERANT
FROM SAFETY SEAL
If there is any leakage, replace the compressor assembly.

AC–110

–

AIR CONDITIONING SYSTEM

Troubleshooting

REMOVAL OF COMPRESSOR

1.  RUN ENGINE AT IDLE SPEED WITH A/C  ON FOR

APPROX. TEN MINUTES

2. STOP 

ENGINE

3. 

DISCONNECT NEGATIVE (–) CABLE FROM BATTERY

4. RECOVER 

REFRIGERANT 

FROM 

REFRIGERATION

SYSTEM

5. 

DISCONNECT DISCHARGE HOSE AND SUCTION HOSE
FROM COMPRESSOR

NOTICE: Cap the open fittings immediately to keep mois-
ture out of the system.

6. 

DISCONNECT CONNECTOR FROM MAGNETIC CLUTCH

7. 

REMOVE DRIVE BELT
See step 6 on page EM–118.

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AIR CONDITIONING SYSTEM

Compressor

AC–111