Lexus ES300 (1997 year). Manual - part 30
N20242
Sight Glass
AC2SY–01
I01386
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–3
1560
1997 LEXUS ES300 (RM511U)
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 set at ”HI”
A/C switch ON
Temperature control set at ”MAX. COOL”
Fully open 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 i sight glass
None, sufficient or too much
Refer to 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 new refrigerant
6
When air conditioning is turned off, refriger-
ant foams and then stays clear
Correct
–
HINT:
*: Bubbles in the sight glass with ambient temperatures higher
than usual can be considered normal if cooling is sufficient.
2.
INSPECT REFRIGERANT PRESSURE WITH MAN-
IFOLD GAUGE SET
This is a method in witch the trouble is located by using a man-
ifold gauge set. Read the manifold gauge pressure when the
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 1,500 rpm
Blower speed control set at ”HI”
Temperature control set at ”MAX COOL”
(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: 0.15 – 0.25 MPa (1.5 – 2.5 kgf/cm
2
)