Air Conditioning System: Overview Lexus LS III рестайлинг

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1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR NAKED 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 cool 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 THE CONTAINER OR EXPOSE IT TO NAKED FLAME
5. BE CAREFUL NOT TO DROP THE CONTAINER OR APPLY PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE THE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN THE REFRIGERANT SYSTEM If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur. Necessary care should be taken to avoid this.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING If the high pressure valves are opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture. Open and close only the low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problem such as insufficient cooling, poor fuel economy, engine overheating etc.
9. DO NOT OPERATE ENGINE AND COMPRESSOR WITH NO REFRIGERANT CAUTION: Doing so may damage the inside of the compressor because the compressor parts always move regardless of whether the A/C system is turned on or off.
10. SUPPLEMENTAL RESTRAINT SYSTEM The LEXUSLS430 is equipped with an SRS (Supplemental Restraint system) such as the driver, front passenger, side, curtain shield air bags etc. Failure to carry out service operation in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices on «AIR BAG SAFETY PRECAUTIONS».
11. PRECAUTION FOR DISCONNECTING THE BATTERY CABLE NOTE: When disconnecting the negative (-) battery terminal, initialize the following system after the terminal is reconnected.

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1. INSPECT REFRIGERANT VOLUME Check the sight glass on the liquid tube. Test conditions: Engine is running at 1,500 RPM Single A/C: Blower speed control switch at "HI" position Dual A/C: Front blower switch at "HI" position Rear blower switch at "HI" position A/C switch ON Single A/C: Temperature control switch at "MAX. COOL" position Dual A/C: Rear temperature control switch at "MAX.COOL" position Front driver side temperature control switch at "MAX.COOL" position Front passenger side temperature control switch at "MAX.COOL" position Fully open the doors
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This is a method in which trouble is located by using 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 to 35°C (86 to 95°F) Engine is running at 2,000 RPM Blower speed control switch is at "HI" Temperature control dial is at "COOL" HINT: It should be noted that the gauge indications may vary slightly due to ambient temperature conditions. Normally functioning refrigeration system Gauge reading: Low pressure side: 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm 2 ) High pressure side: 1.37 to 1.57 MPa (14 to 16 kgf/cm 2 ) Moisture present in refrigeration system Insufficient cooling Poor circulation of refrigerant Refrigerant does not circulate Refrigerant is overcharged or cooling effectiveness of condenser is insufficient Air present in refrigeration system Expansion valve malfunction Defective compression compressor

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1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM Turn the A/C switch on. Operate the cooler compressor at an engine RPM of approximately 1,000 for 5 to 6 minutes to circulate the refrigerant and collect as much compressor oil remaining in each component into the cooler compressor as possible. Stop the engine. Using SST, discharge refrigerant gas. SST 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
2. CHARGE REFRIGERANT Using a vacuum pump, perform vacuum purging. Using SST, charge refrigerant HFC-134a (R134a). Standard: Single A/C: 650+/-50g (22.93+/-1.76 oz.) Dual A/C: 900+/-50g (31.74+/-1.76 oz.) SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) NOTE: Do not start the engine before charging with refrigerant as the cooler compressor doesn't work properly without refrigerant, causing the compressor to overheat.
3. WARM UP ENGINE NOTE: Warm up the engine at less than 2,000 RPM for 2 minutes or more after charging refrigerant.
4. INSPECT FOR REFRIGERANT LEAKAGE Perform in these conditions: Stop the engine. Secure good ventilation (the gas leak detector may not react to volatile gases which are not refrigerant, 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 to 588 kPa (4 to 6 kgf/cm 2 , 57 to 85 psi) Bring the gas leak detector close to the drain hose before performing the test. HINT: After the blower motor has stopped, leave the cooling unit for more than 15 minutes. Hold the gas leak detector sensor under the drain hose. When bringing the gas leak detector close to the drain hose, make sure that the gas leak detector does not react to volatile gases. If such reaction is unavoidable, the vehicle must be lifted up. If a gas leak is not detected on the drain hose, remove the blower motor control (blower resistor) from the cooling unit. Insert the gas leak detector sensor into the unit and perform the test. Disconnect the connector and leave the pressure switch for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and perform the test. Bring the gas leak detector close to the refrigerant lines and perform the test. Remove the air duct No.2. Using a gas leak detector, check for leakage of refrigerant from evaporator and joint. If there is leakage, check the tightening torque at the joints or evaporator.

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See also:
• OVERHAUL
• ENGINE COOLANT
• REPLACEMENT
• REPLACEMENT
• HORN SYSTEM
• OVERHAUL