Air Conditioning System: Diagnosis Lexus LS III рестайлинг

INSPECTION

1. CHECK EVAPORATOR AND HEATER RADIATOR FINS FOR FOREIGN MATTER If foreign matter is attached to the fin, blow it off with compressed air. NOTE: Never use water to clean the evaporator.
2. CHECK FITTING FOR CRACKS OR SCRATCHES Repair as necessary.
3. INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT (SEE «DTC B1413: EVAPORATOR TEMPERATURE SENSOR CIRCUIT»(ref-209356-S08529012872005120900000) )
4. INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) (SEE «DTC B1434: MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)»(ref-209356-S19037405292005120900000) )
5. INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE) (SEE «COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER'S SIDE)»(ref-209356-S14886610292005120900000) )
6. INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE) (SEE «DTC B1435: MAX COOL DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)»(ref-209356-S24301103642005120900000) )
7. INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE) (SEE «COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER SIDE)»(ref-209356-S31147680972005120900000) )
8. INSPECT WATER VALVE CONTROL SERVOMOTOR CIRCUIT (SEE «WATER VALVE CONTROL SERVOMOTOR CIRCUIT»(ref-209356-S29805588042005120900000) )
9. INSPECT AIR VENT MODE DAMPER CONTROL SERVOMOTOR CIRCUIT (SEE «AIR VENT MODE DAMPER CONTROL SERVOMOTOR CIRCUIT»(ref-209356-S26987166232005120900000) )
10. INSPECT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (SEE «AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT»(ref-209356-S19217576402005120900000) )

ON-VEHICLE INSPECTION

1. INSPECT COOLER CONDENSER ASSY If the fins of the cooler condenser assy are dirty, clean them with water and dry them with compressed air. NOTE: Do not damage the fins of the cooler condenser assy. If the fins of the cooler condenser assy are bent, straighten them using a screwdriver or pliers.
2. INSPECT CONDENSER FOR REFRIGERANT LEAKAGE Using a halogen leak detector, check the pipe joints for refrigerant leakage. If refrigerant leakage is detected in a joint, check the torque of the joint.

Scheme 393

Scheme 394

1. INSPECT EXPANSION VALVE Check quantity of gas during refrigeration cycle. Set on manifold gauge set. Run engine. Run the engine at 1,500 RPM for at least 5 minutes. Then check that the high pressure reading is 1.37 to 1.57 Mpa (14 to 16 kgf.cm 2 ,199 to 288 psi). Check expansion valve. If the expansion valve is faulty, the low pressure reading will drop to 0kPa (0 kgf.cm 2 , 0 psi). HINT: When the lower pressure drop to 0kPa (0 kgf.cm 2 , 0 psi), feel the receiver's IN and OUT sides for no temperature difference.

Scheme 395

Scheme 396

Scheme 397

1. INSPECT REAR BLOWER MOTOR CIRCUIT (SEE «REAR BLOWER MOTOR CIRCUIT»(ref-209356-S04214907032005120900000) )
2. EXHAUST DAMPER CONTROL SERVOMOTOR CIRCUIT (SEE «EXHAUST DAMPER CONTROL SERVOMOTOR CIRCUIT»(ref-209356-S17112223182005120900000) )
3. INSPECT REAR MAGNETIC VALVE CIRCUIT (SEE «REAR MAGNETIC VALVE CIRCUIT»(ref-209356-S30145890022005120900000) )
4. INSPECT SMOKE SENSOR CIRCUIT (SEE «SMOKE SENSOR CIRCUIT»(ref-209356-S41426666562005120900000) )
5. INSPECT EVAPORATOR SUB-ASSY (REAR) Check the evaporator sub-assy (rear) fins for blockage. If the fins are clogged, clean them with compressed air. NOTE: Never use water to clean the evaporator sub-assy (rear). Check the fitting for cracks or scratches. If necessary, repair or replace.
6. INSPECT COOLING BOX LAMP SUB-ASSY Connect positive (+) lead to terminal 1 and negative (-) lead to terminal 2. Check that the cooling box lamp sub-assy comes on. If cooling box light does not come on, replace the cooling box lamp sub-assy.