Lexus GS300/400 (2000 year). Manual - part 6

AC0WN–01

AC–28

–

AIR CONDITIONING

AIR CONDITIONING UNIT

2713

INSTALLATION

Installation is in the reverse order of removal (See page 

AC–24

).

AC0WO–01

I02372

I02370
I02371

Instrument Panel

Reinforcement

Blower Unit

Bracket

Wire Harness

Air Duct

No.2 Brace

No.1 Brace

Air Refiner Filter

Cover

Blower Motor

Air Inlet Servomotor

Blower Unit Case

–

AIR CONDITIONING

BLOWER UNIT

AC–29

2714

BLOWER UNIT

COMPONENTS

AC0W7–02

I02352

Sight Glass

–

AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–3

2688

ON–VEHICLE INSPECTION

1.

INSPECT REFRIGERANT VOLUME

Observe the sight glass on the liquid tube.

Test conditions:

Running engine at 1,500 rpm

Blower speed control switch at ”HI” position

A/C switch ON

Temperature control dial at ”COOL” position

Fully open the doors

Item

Symptom

Amount of refrigerant

Remedy

1

Bubbles present in sight glass

Insufficient*

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

2

No bubbles present in sight glass

None, sufficient or too much

Refer item 3 and 4

3

No temperature difference between com-

pressor inlet and outlet

Empty or nearly empty

(1) Check for gas leakage with gas leak de-

tector and repair if necessary

(2) Add refrigerant until bubbles disappear

4

Temperature between compressor inlet and

outlet is noticeably different

Correct or too much

Refer to items 5 and 6

5

Immediately after air conditioning is turned

off, refrigerant in sight glass stays clear

Too much

(1) Discharge refrigerant

(2) Evacuate air and charge proper amount

of purified refrigerant

6

When air conditioning is turned off, refriger-

ant foams and then stays clear

Correct

–

*: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling
is sufficient.

I01386

AC–4

–

AIR CONDITIONING

AIR CONDITIONING SYSTEM

2689

2.

INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET

This is a method in which the trouble is located by using a man-
ifold gauge set. Read the manifold gauge pressure when these
conditions are established.

Test conditions:

Temperature at the air inlet with the switch set
at RECIRC is 30 – 35 

°

C (86 – 95 

°

F)

Engine running at 2,000 rpm

Blower speed control switch at ”HI” position

Temperature control dial on ”COOL” position

HINT:
It should be noted that the gauge indications may vary slightly
due to ambient temperature conditions.

(1)

Normally functioning refrigeration system.

Gauge reading:
Low pressure side:
0.15 – 0.25 MPa (1.5 – 2.5 kgf/cm

2

)

High pressure side:
1.37 – 1.57 MPa (14 – 15 kgf/cm

2)