Lexus RX300 (MCU15). Manual — part 86

N13790

Low Pressure
Service Valve

High Pressure
Service Valve

I07795

Insufficiently
Charged

Properly
Charged

AC–12

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

LEXUS RX300 (RM785E)

3.

CHARGE REFRIGERANT INTO REFRIGERATION
SYSTEM

If there is no leak after refrigerant leak check charge, the proper
amount of refrigerant in to refrigeration system.
CAUTION:

S

Never run the engine when charging the system
through the high pressure side.

S

Do not open the low pressure hand valve when the
system is being charged with liquid refrigerant.

(a)

Open the high pressure hand valve fully.

(b)

Charge specified amount of refrigerant, then close the
high pressure hand valve.

HINT:
A fully charged system is indicated by the sight glass being free
of any bubbles.
(c)

Charge partially refrigeration system with refrigerant.
(1)

Set vehicle in these conditions:

S

Running engine at 1,500 rpm

S

Blower speed control set at ”HI”

S

Temperature control set at ”MAX. COOL”

S

Air inlet control set at ”RECIRC”

S

Fully open doors (Sliding roof : closed)

(2)

Open the low pressure hand valve.

CAUTION:
Do not open the high pressure hand valve.

(3)

Charge refrigerant until bubbles disappear and
check the pressure on the gauge through the sight
glass.

AC1MI–02

I20935

Condenser

Cooling Fan Assembly
(Condenser Fan)

Compressor and
Magnetic Clutch

Magnetic Clutch
Relay
(Marking: MG CLT)

Engine Room
Junction Block

Ambient Temperature Sensor

Pressure Switch

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–13

LEXUS RX300 (RM785E)

LOCATION

I07798

Solar Sensor

Room Temperature Sensor

Integration Control Panel
(Built in the A/C Control Assembly)

Expansion Valve

Evaporator

Air Inlet Servomotor

Air Refiner Filter

Blower Motor

Blower Motor Control Relay

Air Outlet Servomotor

Air Mix Servomotor

Heater Radiator

Evaporator Temperature Sensor

AC–14

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

LEXUS RX300 (RM785E)

CH0086

Correct

Wrong

AC0S0–04

N17028

Crankshaft Pulley

Altarnetor

Compressor

I02495

–

AIR CONDITIONING

DRIVE BELT

AC–15

LEXUS RX300 (RM785E)

DRIVE BELT

ON–VEHICLE INSPECTION

1.

INSPECT DRIVE BELT’S INSTALLATION CONDITION

Check that the drive belt fits properly in the ribbed grooves.

2.

INSPECT DRIVE BELT DEFLECTION

(a)

Using a belt tension gauge, apply load of 98 N (10 kgf).

(b)

Check drive belt deflection.
Drive belt deflection:
New belt: 8.0 – 9.0 mm (0.31 – 0.35 in.)
Used belt: 12.0 – 14.0 mm (0.47 – 0.55 in.)

HINT:

S

”New belt” is a belt which has been used less than 5 min-
utes with the engine running.

S

”Used belt” is a belt which has been used for 5 minutes or
more with the engine running.

S

After installing the drive belt, check that it fits properly in
the ribbed grooves.

3.

INSPECT DRIVE BELT TENSION (Reference)

Using a belt tension gauge, check the drive belt tension.

Drive belt tension:
New belt: 690 – 780 N (70 – 80 kgf)
Used belt: 300 – 440 N (30 – 45 kgf)