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Air Conditioning: Overhaul Lexus IS II

Automatic HVAC System 31 illustrations ~1814 words

DISASSEMBLY

  1. REMOVE MAGNETIC CLUTCH ASSEMBLY (See REMOVAL )

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Scheme 274: INSPECTION
Scheme 274: INSPECTION

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  1. INSPECT A/C COMPRESSOR Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E8-1 (MG+) - A-1 Always Below 1 ohms E8-1 (MG+) - Body ground Always 10 kohms or higher If the resistance is not as specified, replace the A/C compressor.
  2. INSPECT MAGNETIC CLUTCH Measure the resistance of the connector. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition A-1 - Body ground Always 3.4 to 3.8 ohms If the resistance is not as specified, replace the magnetic clutch. When connector terminal A1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch's operating sound can be heard, and 2) the magnetic clutch's hub and rotor lock.
  3. INSPECT A/C COMPRESSOR (LOCK SENSOR) Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition E8-2 (SSR+) - E8-5 (SSR-) 160 to 320 ohms If the resistance is not as specified, replace the A/C compressor.
  4. INSPECT A/C COMPRESSOR (SOLENOID) Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition E8-3 (SOL+) - E8-6 (SOL-) 20°C (68°F) 10 to 11 ohms If the resistance is not as specified, replace the A/C compressor.

REASSEMBLY

  1. INSTALL MAGNETIC CLUTCH ASSEMBLY (See REASSEMBLY )
  2. INSPECT MAGNETIC CLUTCH CLEARANCE (See REASSEMBLY )
  3. ADJUST COMPRESSOR OIL (See REASSEMBLY )

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Scheme 278: INSTALLATION
Scheme 278: INSTALLATION

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  1. TEMPORARILY TIGHTEN COMPRESSOR AND MAGNETIC CLUTCH Using an E8 "torx " socket, install the compressor with the stud bolt. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Temporarily tighten the cooler compressor with magnetic clutch assembly with the 2 bolts and nut.
  2. INSTALL DISCHARGE HOSE SUB-ASSEMBLY (See INSTALLATION )
  3. INSTALL NO. 1 COOLER REFRIGERANT SUCTION HOSE (See INSTALLATION )
  4. INSTALL OIL FILTER BRACKET SUB-ASSEMBLY Install a new oil filter bracket gasket and the oil filter bracket sub-assembly with the 2 nuts and bolt. Torque: 21 N*m (214 kgf*cm, 15 ft.*lbf) Connect the connector and install the wire harness with the 2 clamps.
  5. INSTALL OIL FILTER BRACKET Install the oil filter bracket with the bolt and nut. Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) NOTE: Tighten the bolts in the order shown in the illustration to install the compressor.
  6. FULLY TIGHTEN COMPRESSOR AND MAGNETIC CLUTCH Install the compressor with the bolts and nut. Torque: 25 N*m (255 kgf*cm, 18 ft.*lbf) NOTE: Tighten the bolts in the order shown in the illustration to install the compressor.
  7. INSTALL V-RIBBED BELT (See INSTALLATION )
  8. INSTALL UNDER ENGINE COVER
  9. CHARGE REFRIGERANT (See REPLACEMENT )
  10. WARM UP ENGINE (See REPLACEMENT )
  11. CHECK FOR LEAKAGE OF REFRIGERANT (See REPLACEMENT )
  12. INSTALL NO. 1 INLET AIR CLEANER (See INSTALLATION )
  13. INSTALL V-BANK COVER SUB-ASSEMBLY (See INSTALLATION )
  14. INSTALL COOL AIR INTAKE DUCT SEAL (See INSTALLATION )

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Scheme 284: COMPONENTS
Scheme 284: COMPONENTS

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Scheme 287: REMOVAL
Scheme 287: REMOVAL

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  1. REMOVE COOL AIR INTAKE DUCT SEAL (See REMOVAL )
  2. REMOVE SIDE ENGINE ROOM COVER LH (See REMOVAL )
  3. REMOVE SIDE ENGINE ROOM COVER RH (See REMOVAL )
  4. REMOVE V-BANK COVER SUB-ASSEMBLY (See REMOVAL )
  5. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM Start up the engine. 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 compressor oil remaining in each component into the cooler compressor as much as possible. Stop the engine. Using SST, let the refrigerant gas out. SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
  6. REMOVE NO. 1 INLET AIR CLEANER (See REMOVAL )
  7. REMOVE UNDER ENGINE COVER
  8. REMOVE FRONT BUMPER ASSEMBLY (See REMOVAL )
  9. REMOVE FRONT BUMPER ENERGY ABSORBER
  10. REMOVE RADIATOR SUPPORT OPENING COVER (See REMOVAL )
  11. REMOVE MILLIMETER WAVE RADAR SENSOR ASSEMBLY (w/ Dynamic Radar Cruise Control System) (See REMOVAL )
  12. REMOVE HOOD LOCK CONTROL CABLE COVER (See REMOVAL )
  13. DISCONNECT HOOD LOCK ASSEMBLY (See REMOVAL )
  14. REMOVE RADIATOR SUPPORT UPPER (See REMOVAL )
  15. DISCONNECT LIQUID TUBE SUB-ASSEMBLY Remove the 2 bolts and disconnect the liquid tube sub-assembly from the cooler condenser assembly. Remove the O-ring from the liquid tube subassembly. NOTE: Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering.
  16. DISCONNECT DISCHARGE HOSE SUB-ASSEMBLY Remove the bolt and disconnect the discharge hose sub-assembly from the cooler condenser assembly. Remove the O-ring from the discharge hose subassembly. NOTE: Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering.
  17. REMOVE COOLER CONDENSER ASSEMBLY Remove the 4 bolts and cooler condenser assembly.
  18. REMOVE COOLER DRYER Using a straight hexagon wrench 14 mm, remove the cap from the modulator. Using pliers, remove the cooler dryer.

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Scheme 292: INSTALLATION
Scheme 292: INSTALLATION

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  1. INSTALL COOLER DRYER Using pliers, install the cooler dryer to the modulator. Sufficiently apply compressor oil to an O-ring and cap fitting surface. Compressor oil: ND-OIL 8 or equivalent Using a straight hexagon wrench 14 mm, install the cap to the cooler condenser core. Torque: 2.9 N*m (30 kgf*cm, 26 in.*lbf)
  2. INSTALL COOLER CONDENSER ASSEMBLY Install the cooler condenser assembly with the 4 bolts. Torque: 5.0 N*m (51 kgf*cm, 44 in.*lbf) HINT: If the condenser is replaced with a new one, add compressor oil to the new condenser. Capacity: 40 cc (1.4 fl. oz.) Compressor oil: ND-8 or equivalent
  3. INSTALL DISCHARGE HOSE SUB-ASSEMBLY Remove the attached vinyl tape from the hose and the connecting part of the cooler condenser assembly. Sufficiently apply compressor oil to a new O-ring and the fitting surface of the hose joint. Compressor oil: ND-OIL 8 or equivalent Install the O-ring on the discharge hose subassembly. Install the discharge hose sub-assembly on the cooler condenser assembly with the bolt. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf)
  4. INSTALL LIQUID TUBE SUB-ASSEMBLY Remove the attached vinyl tape from the pipe and the connecting part of the cooler condenser assembly. Sufficiently apply compressor oil to a new O-ring and the fitting surface of the pipe joint. Compressor oil: ND-OIL 8 or equivalent Install the O-ring on the liquid tube sub-assembly. Install the liquid tube sub-assembly on the cooler condenser assembly with the 2 bolts. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf)
  5. INSTALL RADIATOR SUPPORT UPPER (See INSTALLATION )
  6. INSTALL HOOD LOCK ASSEMBLY (See INSTALLATION )
  7. INSTALL HOOD LOCK CONTROL CABLE COVER (See INSTALLATION )
  8. INSTALL MILLIMETER WAVE RADAR SENSOR ASSEMBLY (w/ Dynamic Radar Cruise Control System) (See INSTALLATION )
  9. INSTALL RADIATOR SUPPORT OPENING COVER (See INSTALLATION )
  10. INSTALL FRONT BUMPER ENERGY ABSORBER
  11. INSTALL FRONT BUMPER ASSEMBLY
  12. INSTALL UNDER ENGINE COVER
  13. INSTALL NO. 1 INLET AIR CLEANER (See INSTALLATION )
  14. CHARGE REFRIGERANT (See REPLACEMENT )
  15. WARM UP ENGINE (See REPLACEMENT )
  16. CHECK FOR LEAKAGE OF REFRIGERANT (See REPLACEMENT )
  17. INSTALL V-BANK COVER SUB-ASSEMBLY (See INSTALLATION )
  18. INSTALL SIDE ENGINE ROOM COVER LH (See INSTALLATION )
  19. INSTALL SIDE ENGINE ROOM COVER RH (See INSTALLATION )
  20. INSTALL COOL AIR INTAKE DUCT SEAL (See INSTALLATION )

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Scheme 298: COMPONENTS
Scheme 298: COMPONENTS

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Scheme 299: REMOVAL
Scheme 299: REMOVAL
  1. DISCONNECT CABLE FROM NEGATIVE BATTERY CAUTION: Wait for 90 seconds after disconnecting the cable to prevent airbag deployment. (See PRECAUTION )
  2. REMOVE FRONT DOOR SCUFF PLATE LH (w/o Illumination) (See REMOVAL )
  3. REMOVE FRONT DOOR SCUFF PLATE LH (w/ Illumination) (See REMOVAL )
  4. REMOVE FRONT DOOR OPENING TRIM COVER LH (See INSTALLATION )
  5. REMOVE SIDE INSTRUMENT PANEL LH (See REMOVAL )
  6. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY (See REMOVAL )
  7. REMOVE LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY (See REMOVAL )
  8. REMOVE DRIVER SIDE KNEE AIRBAG ASSEMBLY (See REMOVAL )
  9. REMOVE ROOM TEMPERATURE SENSOR Disconnect the connector and air hose. Detach the claw and remove the sensor.

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Scheme 300: INSPECTION
Scheme 300: INSPECTION
  1. INSPECT ROOM TEMPERATURE SENSOR Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition J38-1 - J38-2 10°C (50°F) 3.00 to 3.73 kohms J38-1 - J38-2 15°C (59°F) 2.45 to 2.88 kohms J38-1 - J38-2 20°C (68°F) 1.95 to 2.30 kohms J38-1 - J38-2 15°C (77°F) 1.60 to 1.80 kohms J38-1 - J38-2 30°C (86°F) 1.28 to 1.47 kohms J38-1 - J38-2 35°C (95°F) 1.00 to 1.22 kohms J38-1 - J38-2 40°C (104°F) 0.80 to 1.00 kohms J38-1 - J38-2 45°C (113°F) 0.65 to 0.85 kohms J38-1 - J38-2 50°C (122°F) 0.50 to 0.70 kohms J38-1 - J38-2 55°C (131°F) 0.44 to 0.60 kohms J38-1 - J38-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Hold the sensor only by its connector. Touching the sensor may change the resistance value. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (see the graph). If the resistance is not as specified, replace the room temperature sensor.

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Scheme 301: INSTALLATION
Scheme 301: INSTALLATION
  1. INSTALL ROOM TEMPERATURE SENSOR Install the sensor with the claw. Connect the connector and attach the air hose.
  2. INSTALL DRIVER SIDE KNEE AIRBAG ASSEMBLY (See INSTALLATION )
  3. INSTALL LOWER INSTRUMENT PANEL FINISH PANEL SUB-ASSEMBLY (See INSTALLATION )
  4. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY (See INSTALLATION )
  5. INSTALL SIDE INSTRUMENT PANEL LH (See INSTALLATION )
  6. INSTALL FRONT DOOR OPENING TRIM COVER LH (See INSTALLATION )
  7. INSTALL FRONT DOOR SCUFF PLATE LH (w/o Illumination) (See INSTALLATION )
  8. REMOVE FRONT DOOR SCUFF PLATE LH (w/ Illumination) (See INSTALLATION )
  9. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
  10. PERFORM INITIALIZATION NOTE: Some systems need initialization after reconnecting the cable to the negative battery terminal (See INITIALIZATION )
  11. INSPECT SRS WARNING LIGHT (See DIAGNOSIS SYSTEM )

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Scheme 302: COMPONENTS
Scheme 302: COMPONENTS

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Scheme 303: REMOVAL
Scheme 303: REMOVAL
  1. REMOVE COOL AIR INTAKE DUCT SEAL (See REMOVAL )
  2. REMOVE FRONT BUMPER ASSEMBLY (See REMOVAL )
  3. REMOVE AMBIENT TEMPERATURE SENSOR Disconnect the connector and detach the clamp. Remove the ambient temperature sensor.

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Scheme 304: INSPECTION
Scheme 304: INSPECTION
  1. INSPECT AMBIENT TEMPERATURE SENSOR Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition B5-1 - B5-2 10°C (50°F) 3.00 to 3.73 kohms B5-1 - B5-2 15°C (59°F) 2.45 to 2.88 kohms B5-1 - B5-2 20°C (68°F) 1.95 to 2.30 kohms B5-1 - B5-2 25°C (77°F) 1.60 to 1.80 kohms B5-1 - B5-2 30°C (86°F) 1.28 to 1.47 kohms B5-1 - B5-2 35°C (95°F) 1.00 to 1.22 kohms B5-1 - B5-2 40°C (104°F) 0.80 to 1.00 kohms B5-1 - B5-2 45°C (113°F) 0.65 to 0.85 kohms B5-1 - B5-2 50°C (122°F) 0.50 to 0.70 kohms B5-1 - B5-2 55°C (131°F) 0.44 to 0.60 kohms B5-1 - B5-2 60°C (140°F) 0.36 to 0.50 kohms NOTE: Even slightly touching the sensor may change the resistance value. Be sure to hold the connector of the sensor. When measuring, the sensor temperature must be the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (see the graph). If the resistance is not as specified, replace the ambient temperature sensor.

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