Lexus GS300/400 (2000 year). Manual - part 1

AC2810

AC0W6–01

AC2811

N11084

Wrong

Okay

HI

LO

HI

LO

–

AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–1

2686

AIR CONDITIONING SYSTEM

PRECAUTION

1.

DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR NEAR AN OPEN FLAME

2.

ALWAYS WEAR EYE PROTECTION

3.

BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN
YOUR EYES OR ON YOUR SKIN

If liquid refrigerant gets in your eyes or on your skin.
(a)

Wash the area with lots of cool water.

CAUTION:
Do not rub your eyes or skin.
(b)

Apply clean petroleum jelly to the skin.

(c)

Go immediately to a physician or hospital for professional
treatment.

4.

NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME

5.

BE CAREFUL NOT TO DROP CONTAINER AND NOT
TO APPLY PHYSICAL SHOCKS TO IT

6.

DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM

If there is not enough refrigerant in the refrigerant system oil lu-
brication will be insufficient and compressor burnout may occur,
so take care to avoid this, necessary care should be taken.
7.

DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE
WHILE COMPRESSOR IS OPERATING

If the high pressure valves opened, refrigerant flows in the re-
verse direction and could cause the charging cylinder to rup-
ture, so open and close the only low pressure valve.
8.

BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT

If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.

AC–2

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

2687

9.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

The Lexus GS 300/ 400 is equipped with an SRS (Supplemen-
tal Restraint System) such as the driver and passenger airbag.
Failure to carry out service operations in the correct sequence
could cause the SRS to unexpectedly deployed during servic-
ing, possibly leading to a serious accident. Further, if a mistake
is made in servicing the SRS, it is possible the SRS may fail to
operate when required. Before servicing ( including removal or
installation of parts, inspection or replacement), be sure to read
the following item carefully, then follow the correct procedure
described in repair manual.

AC0W8–01

N13795

Quick Disconnect
Adapter

Charging

Service Valve

Hose

N13794

Vacuum Pump

Vacuum Pump Adapter

N13791

Low Pressure
Service Valve

Vacuum Pump Adapter

High Pressure
Service Valve

Manifold
Gauge
Set

AC–10

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

2695

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 adapters 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 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 if 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.

AC0W9–01

N13793

Charging Cylinder

High Pressure

Service Valve

Low Pressure

Service Valve

Push

Air

N13792

Gas Leak

Detector

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AIR CONDITIONING

AIR CONDITIONING SYSTEM

AC–11

2696

CHARGING

1.

INSTALL CHARGING CYLINDER

HINT:
When handling the charging cylinder, always follow the direc-
tions given in the instruction manual.
(a)

Charge the proper amount of refrigerant into the charging
cylinder.

(b)

Connect the center hose to the charging cylinder.

CAUTION:
Do not open both high and low hand valves of manifold
gauge set.
(c)

Open the valve of charging cylinder.

(d)

Press the valve core on the side of manifold gauge and
expel the air inside of the center hose.

2.

INSPECT REFRIGERATION SYSTEM FOR LEAKS

(a)

Open the high pressure hand valve and charge refriger-
ant.

(b)

When the low pressure gauge indicates 98 kPa 
(1 kgf/cm

2

, 14 psi) close the high pressure hand valve.

(c)

Using a gas leak detector, check the system for leakage.

If leak is found, repair the faulty component or connection.
CAUTION:
Use the refrigerant recovery/ recycling machine to recover
the refrigerant whenever replacing parts.