Lexus GS300/400 (2000 year). Service manual — part 6
AC0WN–01
AC–28
–
AIR CONDITIONING
AIR CONDITIONING UNIT
2713
INSTALLATION
Installation is in the reverse order of removal (See page
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)
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