Heater & Air Conditioner: Overview Lexus GX J120

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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. Wash the area with lots of cold water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. 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 OR 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 lubrication 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 valve is opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close only the low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.

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1. INSPECT REFRIGERANT VOLUME Observe the sight glass on the cooler refrigerant liquid pipe A. Test conditions: Engine is running at 1,500 rpm Blower speed control switch is at "HI" A/C switch is ON Temperature control dial is at "MAX. COOL" Doors are fully open. *: Bubbles in the sight glass with ambient temperatures higher than usual can be considered normal if cooling is sufficient.
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This is a method in which the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when these conditions are established. Test conditions: Temperature at the air inlet with the switch set at RECIRC is 30 - 35°C (86 - 95°F) Engine is running at 1,500 rpm Blower speed control switch is at "HI" Temperature control dial is at "COOL" A/C switch is ON Doors are fully open. Normally functioning refrigeration system. Gauge reading: Low pressure side: 0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm 2 ) High pressure side: 1.37 - 1.57 MPa (14-16 kgf/cm 2 ) Moisture present in refrigeration system. Insufficient cooling Poor circulation of refrigerant Refrigerant does not circulate Refrigerant is overcharged or cooling of effectiveness of condenser is insufficient Air present in refrigeration system Expansion valve improper Defective compression compressor Gauge readings (Reference)

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1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM Turn the A/C switch to ON. Operating the cooler compressor at the engine rpm of approx. 1,000 for 5 to 6 min., circulate the refrigerant and collect the compressor oil remaining in each component into the cooler compressor as much as possible. Stop the engine. Let the refrigerant gas out. SST 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
2. CHARGE REFRIGERANT Using a vacuum pump, perform a vacuum purging. Charge refrigerant, HFC-134a (R134a). Standard: Single A/C: 600 +/- 30 g (21.16 +/- 1.06 oz.) Dual A/C: 800 +/- 30 g (28.21 +/- 1.06 oz.) SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
3. WARM UP ENGINE
4. INSPECT LEAKAGE OF REFRIGERANT Using a gas leak detector, check for leakage of the refrigerant.

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See also:
• COOLANT (2UZ-FE)