Lexus GS300/400 (2000 year). Manual - part 7
I01387
Condition : Periodically cools and then fails to cool
I01388
Condition: Insufficient cooling
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–5
2690
(2)
Moisture present in refrigeration system.
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
During operation, pressure on low
pressure side sometimes become
a vacuum and sometime normal
Moisture entered in refrigeration
system freezes at expansion valve
orifice and temporarily stops cycle,
but normal state is restored after a
time when the ice melts
Dryer in oversaturated state
Moisture in refrigeration system
freezes at expansion valve orifice
and blocks circulation of refriger-
ant
(1) Replace dryer
(2) Remove moisture in cycle
through repeatedly evacuating air
(3) Charge proper amount of new
refrigerant
(3)
Insufficient cooling
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure low on both low and
high pressure sides
Bubbles seen in sight glass con-
tinuously
Insufficient cooling performance
Gas leakage at some place in re-
frigeration system
Insufficient refrigerant in system
Refrigerant leaking
(1) Check for gas leakage with gas
leak detector and repair if neces-
sary
(2) Charge proper amount of re-
frigerant
(3) If indicated pressure value is
near 0 when connected to gauge,
create the vacuum after inspecting
and repairing the location of the
leak