AIR CONDITIONING - AIR CONDITIONING SYSTEM AIR ...

1 AC2810AC15I-04AC2811N11084 WrongOkayHILOHILO-AIR CONDITIONINGAIR CONDITIONING SYSTEMAC-12467 Author :Date :2005 LEXUS is300 (RM1140U)AIR CONDITIONING NOT HANDLE REFRIGERANT IN AN ENCLOSEDAREA OR NEAR AN OPEN WEAR EYE CAREFUL NOT TO GET LIQUID REFRIGERANT INYOUR EYES OR ON YOUR SKINIf liquid refrigerant gets in your eyes or on your skin.(a)Wash the area with lots of cool :Do not rub your eyes or skin.(b)Apply clean petroleum jelly to the skin.(c)Go immediately to a physician or hospital for HEAT CONTAINER OR EXPOSE IT TO CAREFUL NOT TO DROP CONTAINER AND NOTTO APPLY PHYSICAL SHOCKS TO NOT OPERATE COMPRESSOR WITHOUTENOUGH REFRIGERANT IN REFRIGERANT SYSTEMIf 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 NOT OPEN HIGH PRESSURE MANIFOLD VALVEWHILE COMPRESSOR IS OPERATINGIf the high pressure valves opened, refrigerant flows in the re-verse direction and could cause the charging cylinder to rup-ture.

2 So open and close the only low pressure CAREFUL NOT TO OVERCHARGE SYSTEM WITHREFRIGERANTIf refrigerant is overcharged, it causes problems such as insuffi-cient cooling, poor fuel economy, engine overheating CONDITIONINGAIR CONDITIONING SYSTEM2468 Author :Date :2005 LEXUS is300 (RM1140U) RESTRAINT SYSTEM (SRS)The LEXUS is300 is equipped with an SRS (Supplemental Re-straint SYSTEM ) such as the driver, passenger and side to carry out service operations in the correct sequencecould cause the SRS to unexpectedly deploy during servicing,possibly leading to a serious accident. Before servicing (includ-ing removal or installation of parts, inspection or replacement),be sure to read the precautionary notices in the RS DisconnectAdapterChargingService ValveHoseN13794 Vacuum PumpVacuum Pump AdapterN13791 Low PressureService ValveVacuum Pump AdapterHigh PressureService ValveManifoldGaugeSetAC-10-AIR CONDITIONINGAIR CONDITIONING SYSTEM2476 Author :Date :2005 LEXUS is300 (RM1140U) QUICK DISCONNECT ADAPTER TOCHARGING CAPS FROM SERVICE VALVES ON RE-FRIGERANT ON MANIFOLD GAUGE SET(a)Close both hand valves of manifold gauge set.

3 (b)Connect the quick disconnect adapters to the 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 thevacuum 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 pressuregauge indicates 750 mmHg (30 in. Hg) or :If the reading is 750 mmHg (30 in. Hg) or more, close both handvalves of manifold gauge set and stop the vacuum the SYSTEM for leaks and repair if necessary.(e)Close both the high and low hand valves and stop the vac-uum pump.

4 (f)Leave the SYSTEM in this condition for 5 minutes or moreand check that there is no gauge CylinderHigh PressureService ValveLow PressureService ValvePushAirN13792 Gas LeakDetector-AIR CONDITIONINGAIR CONDITIONING SYSTEMAC-1 12477 Author :Date :2005 LEXUS is300 (RM1140U) CHARGING CYLINDERHINT:When handling the charging cylinder, always follow the direc-tions given in the instruction manual.(a)Charge the proper amount of refrigerant into the chargingcylinder.(b)Connect the center hose to the charging :Do not open both high and low hand valves of manifoldgauge set.(c)Open the valve of charging cylinder.

5 (d)Press the valve core on the side of manifold gauge andexpel the air inside of the center 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/cm2, 14 psi) close the high pressure hand valve.(c)Using a gas leak detector, check the SYSTEM for leak is found, repair the faulty component or :Use the refrigerant recovery/ recycling machine to recoverthe refrigerant whenever replacing PressureService ValveHigh PressureService ValveI11031 ProperlyChargedInsufficientlyChargedAC-1 2-AIR CONDITIONINGAIR CONDITIONING SYSTEM2478 Author :Date :2005 LEXUS is300 (RM1140U) REFRIGERANT INTO REFRIGERATIONSYSTEMIf there is no leak after refrigerant leak check charge, the properamount of refrigerant in to refrigeration.

6 Never run the engine when charging the systemthrough the high pressure side. Do not open the low pressure hand valve when thesystem is being charged with liquid refrigerant.(a)Open he high pressure hand valve fully.(b)Charge specified amount of refrigerant, then close thehigh pressure hand :A fully charged SYSTEM is indicated by the sight glass being freeof any bubbles.(c)Charge partially refrigeration SYSTEM with refrigerant.(1)Set vehicle in these conditions: Running engine at 1,500 rpm Blower speed control set at HI Temperature control set at MAX. COOL position Air inlet control set at RECIRC Fully open doors (Sliding roof : closed)(2)Open the low pressure hand :Do not open the high pressure hand valve.

7 (3)Charge refrigerant until bubbles disappear andcheck the pressure on the gauge through the FanCondenserWater Temperature SwitchEngine Room Relay Block No. 2 Cooling Fan Relay No. 3 Cooling Fan Relay Magnetic Clutch RelayPassenger Side Junction Block Heater Main RelayA/C ControlAssemblySolar SensorRoom Temperature SensorEvaporatorTemperature SensorEvaporatorExpansion ValveHeater RadiatorAir Outlet ServomotorAir Mix ServomotorBlower Motor Control RelayBlower MotorAir Refiner FilterCompressorAir Inlet Servomotor-AIR CONDITIONINGAIR CONDITIONING SYSTEMAC-132479 Author :Date :2005 LEXUS is300 (RM1140U)LOCATIONAC20D-03AC-14-AIR CONDITIONINGTROUBLESHOOTING2480 Author :Date.

8 2005 LEXUS is300 (RM1140U)TROUBLESHOOTINGPROBLEM SYMPTOMS TABLEUse the table below to help you find the cause of the problem. The numbers indicate the priority of the likelycause of the problem. Check each part in order If necessary , replace these AreaSee pageWhole functions of A/C SYSTEM do not operate1. Fuse2. A/C control assembly-AC-79No blower operation1. Heater main relay2. Blower motor3. Blower motor control relay4. A/C control assembly5. Wire harnessAC-69AC-55AC-56AC-79-No blower control1. Blower motor2. Blower motor control relay3. A/C control assembly4. Wire harnessAC-55AC-56AC-79-Insufficient air out1.

9 Blower motorAC-55No cool air comes out1. Refrigerant volume2. Drive belt3. Refrigerant pressure4. Compressor5. Pressure switch6. Igniter circuit7. Air mix servomotor8. Room temp. sensor9. Ambient temp. control harnessAC-3AC-16AC-3AC-38AC-66-AC-30AC-6 2AC-63AC-79-No warm air comes out1. Engine coolant volume2. Air mix servomotor3. Ambient temp. sensor4. Room temp. sensor5. A/C control assembly6. Heater radiator-AC-30AC-63AC-62AC-79AC-30 Out put air is warmer or cooler than the set temperature or re-sponse is slow1. Refrigerant volume2. Engine coolant volume3. Drive belt4. Refrigerant pressure5.

10 Condenser fan6. Ambient temp. sensor7. Evaporator temp. sensor8. Solar sensor9. Air mix control harnessAC-3-AC-16AC-3AC-72AC-63AC-64AC-6 1AC-30AC-38AC-47AC-30AC-30AC-52AC-79-No temperature control1. Air mix servomotor2. A/C control assemblyAC-30AC-79-AIR CONDITIONINGTROUBLESHOOTINGAC-152481 Author :Date :2005 LEXUS is300 (RM1140U)No air inlet control1. Air inlet servomotor2. A/C control assembly3. Wire harnessAC-57AC-79-No mode control1. Air outlet servomotor2. A/C control assembly3. Wire harnessAC-59AC-79-No engine idle-up when A/C switch ON1. A/C control assembly2. Wire harnessAC-79-Set temperature value does not match up with operation of tem-perature control switch1.