Lexus RX300 (MCU15). Manual - part 93

AC1MW–02

AC–40

–

AIR CONDITIONING

BLOWER UNIT

LEXUS RX300   (RM785E)

INSPECTION

1.

INSPECT AIR INLET SERVOMOTOR OPERATION (See page DI–844)

2.

INSPECT AIR INLET DAMPER POSITION SENSOR (See page DI–835)

AC1MX–01

–

AIR CONDITIONING

BLOWER UNIT

AC–41

LEXUS RX300   (RM785E)

REASSEMBLY

Reassembly is in the reverse order of disassembly (See page AC–39).

AC1MY–01

AC–42

–

AIR CONDITIONING

BLOWER UNIT

LEXUS RX300   (RM785E)

INSTALLATION

Installation is in the reverse order of removal (See page AC–38).

AC1MZ–01

I06868

1

2

I06875

3

–

AIR CONDITIONING

COMPRESSOR AND MAGNETIC CLUTCH

AC–43

LEXUS RX300   (RM785E)

COMPRESSOR AND MAGNETIC
CLUTCH

ON–VEHICLE INSPECTION

1.

INSPECT COMPRESSOR FOR METALLIC SOUND

(a)

Start engine.

(b)

Check there is abnormal metallic sound from the com-
pressor when the A/C switch is ON.

If abnormal sound is heard, replace the compressor assembly.
2.

INSPECT REFRIGERANT PRESSURE
(See page AC–3)

3.

INSPECT COMPRESSOR LOCK SENSOR RESIS-
TANCE

(a)

Disconnect the connector.

(b)

Measure resistance between terminals 1 and 2.
Standard resistance: 65 – 125 Ω at 20 °C (68 °F)

If resistance is not as specified, rerplace the compressor as-
sembly.
4.

INSPECT VISUAL FOR LEAKAGE OF REFRIGERANT
FROM SAFETY SEAL

Using a gas leak detector, check for leakage of refrigerant.
If there is any leakage, replace the compressor assembly.
5.

MAKE THESE VISUAL CHECKS:

(a)

Leakage of grease from the cluch bearing.

(b)

Signs of oil on the pressure plate

If necessary repair or replace.
6.

INSPECT MAGNETIC CLUTCH BEARING FOR NOISE

(a)

Start engine.

(b)

Check for abnormal noise near the compressor when the
A/C switch is OFF.

If abnormal noise is being emitted, replace the magnetic clutch.
7.

INSPECT MAGNETIC CLUTCH OPERATION

(a)

Disconnect the connector.

(b)

Connect the positive (+) lead from the battery to terminal
4 and the negative (–) lead to the body ground.

(c)

Check that the magnetic clutch is energized.

If operation is not as specified, replace the magnetic clutch.