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
I01389
Condition: Insufficient cooling
I01449
Condition: Does not cool (Cools from time to time in some cases)
AC–6
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
2691
(4)
Poor circulation of refrigerant
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure low in both low and
high pressure sides
Frost on tube from condenser to
unit
Refrigerant flow obstructed by dirt
in condenser
condenser clogged
Replace condenser
(5)
Refrigerant does not circulate
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Vacuum indicated on low pres-
sure side, very low pressure indi-
cated on high pressure side
Frost or dew seen on piping be-
fore and after condenser/ dryer or
expansion valve
Refrigerant flow obstructed by
moisture or dirt in refrigeration sys-
tem
Refrigerant flow obstructed by
gas leakage from expansion valve
Refrigerant does not circulate
(1) Check expansion valve
(2) Clean out dirt in expansion
valve by blowing with air
(3) Replace condenser
(4) Evacuate air and charge new
refrigerant to proper amount
(5) For gas leakage from expan-
sion valve, replace expansion
valve
I01390
Condition: Insufficient cooling
I01392
Condition: Insufficient cooling
NOTE : These gauge indica-
tions are shown when the
refrigeration system has
been opened and the refrig-
erant charged without vacu-
um purging.
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–7
2692
(6)
Refrigerant overcharged or insufficient cooling of
condenser
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on both low
and high pressure sides
No air bubbles seen through the
sight glass even when the engine
rpm is lowered
Unable to develop sufficient per-
formance due to excessive refrig-
eration system
Insufficient cooling of condenser
Excessive refrigerant in
cycle
→
refrigerant over charged
Condenser cooling
→
condenser
fins clogged of condenser fan
faulty
(1) Clean condenser
(2) Check condenser fan motor
operation
(3) If (1) and (2) are in normal
state, check amount of refrigerant
Charge proper amount of refriger-
ant
(7)
Air present in refrigeration system
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on both low
and high pressure sides
The low pressure piping hot to
touch
Bubbles seen in sight glass
Air entered in refrigeration system
Air present in refrigeration sys-
tem
Insufficient vacuum purging
(1) Check compressor oil to see if
it is dirty or insufficient
(2) Evacuate air and charge new
refrigerant
I01450
Condition: Insufficient cooling
I01393
Condition : Does not cool
AC–8
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
2693
(8)
Expansion valve improperly
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on both low
and high pressure sides
Frost or large amount of dew on
piping on low pressure side
Trouble in expansion valve
Excessive refrigerant in low
pressure piping
Expansion valve opened too
wide
Check expansion valve
Replace if defective
(9)
Defective compression compressor
Symptom seen in
refrigeration system
Probable cause
Diagnosis
Remedy
Pressure too high on low and
high pressure sides
Pressure too low on high pres-
sure side
Internal leak in compressor
Compression defective
Valve leaking or broken sliding
parts
Repair or replace compressor
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст