Lexus ES300 (1997 year). Manual — part 31
I01450
Condition: Insufficient cooling
I01393
Condition : Does not cool
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–7
1564
1997 LEXUS ES300 (RM511U)
(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
N14519
Drain Hose
AC–8
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
1565
1997 LEXUS ES300 (RM511U)
3.
INSPECT IDLE–UP SPEED
(a)
Warm up engine
(b)
Inspect idle–up speed when the these conditions are es-
tablished.
Test conditions:
Blower speed control set at ”HI”
Temperature control set at ”MAX COOL”
A/C switch ON
Put gear shift in neutral
Magnetic clutch condition
Idle speed
Magnetic clutch not engaged
700
±
50 rpm
Magnetic clutch engaged
700
±
50 rpm
If idle speed is not as specified, check IAC valve and air intake
system.
4.
INSPECT FOR LEAKAGE OF REFRIGERANT
(a)
Perform under these conditions:
Stop engine
Secure good ventilation (If not, the gas leak detec-
tor may react to volatile gases which are not refrig-
erant, such as evaporated gasoline or exhaust
gas.)
Repeat the test 2 or 3 times
Make sure that there is some refrigerant remaining
in the refrigeration system.
When compressor is OFF: Approx. 392 – 588 kPa
(4 – 6 kgf/cm
2
, 57 – 85 psi)
(b)
Bring the gas leak detector close to the drain hose before
performing the test.
HINT:
After the blower motor is stopped, leave the A/C unit for
more than 15 minutes.
Expose the gas leak detector sensor the under the drain
hose.
When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not reach to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c)
If gas leak is not detected through the drain hose, remove
the blower linear controller from the A/C unit. Then insert
the gas leak detector sensor into the unit and perform the
test.
N14517
Gas Leak
Detector
Pressure
Switch
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–9
1566
1997 LEXUS ES300 (RM511U)
(d)
Disconnect the connector and leave the pressure switch
for approx. 20 minutes. Then bring the gas leak detector
close to the pressure switch and perform the test.
(e)
Bring the gas leak detector close to the refrigerant lines
and perform the test.
HINT:
Make sure that there is no dirt on joints.
AC09E–01
N13795
Quick Disconnect
adapter
Charging Hose
Service Valve
N13794
Vacuum Pump
Vacuum Pump Adapter
N13791
Manifold
Gauge Set
High Pressure
Service Valve
Low Pressure
Service Valve
Vacuum Pump
Adapter
AC–10
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
1567
1997 LEXUS ES300 (RM511U)
EVACUATING
1.
CONNECT QUICK DISCONNECT ADAPTER TO
CHARGING HOSES
2.
REMOVE CAPS FROM SERVICE VALVES ON RE-
FRIGERANT LINES
3.
SET ON MANIFOLD GAUGE SET
(a)
Close both hand valves of manifold gauge set.
(b)
Connect the quick disconnect adapter to the service
valves.
4.
EVACUATE AIR FROM REFRIGERATION SYSTEM
(a)
Connect the vacuum pump adapter to the vacuum pump.
(b)
Connect the center hose of the manifold gauge set to the
vacuum pump adapter.
(c)
Open both the high and low hand valves and run the vacu-
um pump.
(d)
After 10 minutes or more, check that the low pressure
gauge indicates 750 mmHg (30 in.Hg) or more.
HINT:
If the reading is not 750 mmHg (30 in.Hg) or more, close both
hand valves of manifold gauge set and stop the vacuum pump.
Check the system for leaks and repair as necessary.
(e)
Close both the high and low hand valves and stop the vac-
uum pump.
(f)
Leave the system in this condition for 5 minutes or more
and check that there is no gauge indicator.
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