Lexus GS300/400 (2000 year). Manual - part 8
–
AIR CONDITIONING
AIR CONDITIONING SYSTEM
AC–9
2694
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 switch at ”HI” position
Temperature control dial at ”COOL” position
A/C switch ON
Put gear shift in neutral
GS300:
Magnetic clutch condition
Idle–up speed
Magnetic clutch not engaged
700
±
50 rpm
Magnetic clutch engaged
800
±
50 rpm
If idle speed is not as specified, check the idle control system.
GS400:
Magnetic clutch condition
Idle–up speed
Magnetic clutch not engaged
750
±
50 rpm
Magnetic clutch engaged
800
±
50 rpm
If idle speed is not as specified, check the idle control system.
4.
INSPECT FOR LEAKAGE OF REFRIGERANT
(a)
Perform in these conditions.
Stop engine
Secure good ventilation (If the gas leak detector
may not react volatile gases which are not refriger-
ant, such as evaporated gasoline and 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 has stopped, leave the cooling for
more than 15 minutes.
Expose the gas leak detector sensor under the drain
hose.
When bring the gas leak detector close to the drain hose,
make sure that the gas leak detector does not react to the
volatile gases.
If such reaction is unavoidable, the vehicle must be lifted up.
(c)
If gas leak is not detected on the drain hose, remove the
blower resistor from the cooling unit. Then insert the gas
leak detector sensor into the unit and perform the test.
(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.