Air Conditioning System (Service Information): Overview Lexus GS IV

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1. INSPECT REFRIGERANT VOLUME Check the sight glass. Prepare the vehicle according to the chart below. Item Condition Vehicle doors Fully open Temperature setting Max cool Power switch On (Ready) Blower speed High A/C switch On Compare the sight glass to the following chart. Item Symptom Amount of Refrigerant Corrective Action 1 Bubbles exist Insufficient* Check for refrigerant leaks and repair if necessary Recharge air conditioning system with proper amount of refrigerant 2 No bubbles exist Empty, insufficient or excessive Refer to 3 and 4 3 No temperature difference between compressor inlet and outlet Empty or nearly empty Check for refrigerant leaks and repair if necessary Evacuate air conditioning system and recharge with proper amount of refrigerant 4 Considerable temperature difference between compressor inlet and outlet Proper or excessive Refer to 5 and 6 5 Immediately after air conditioning is turned off, refrigerant in sight glass remains clear Excessive Recover refrigerant Evacuate air conditioning system and recharge with proper amount of refrigerant 6 Immediately after air conditioning is turned off, refrigerant in sight glass foams and then becomes clear Proper - *: Bubbles in the sight glass with the vehicle's interior temperature above 35°C (95°F) can be considered normal if cooling is sufficient. TEXT IN ILLUSTRATION *1 Sight Glass
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET HINT: The following examples show the readings of a manifold gauge set and the corresponding air conditioning system problems. Read the manifold gauge pressure when the following conditions are met: Doors are fully open. The power switch is on (READY). The A/C switch is on. The temperature is set to max cool. The blower speed is set to high. Temperature at the air inlet with recirculate mode selected is 30 to 35°C (86 to 95°F). Normally functioning air conditioning system GAUGE READING Pressure Side Refrigerant Volume Low 147 to 245 kPa (1.5 to 2.5 kgf/cm 2 , 21 to 36 psi) High 1373 to 1569 kPa (14 to 16 kgf/cm 2 , 199 to 228 psi) Abnormally functioning air conditioning system During operation, pressure on low pressure side cycles between normal and vacuum Symptom Air conditioning system periodically cools and then fails to cool. Probable Cause Moisture in air conditioning system freezes at expansion valve orifice, causing refrigerant to temporarily stop circulating After system stops, and warms up again, ice melts and normal operation is temporarily restored Diagnosis Cooler dryer (integrated into condenser tank) saturated with moisture Moisture in air conditioning system freezes at expansion valve orifice and blocks circulation of refrigerant Corrective Actions Replace cooler dryer Remove moisture by repeatedly evacuating air from air conditioning system Recharge air conditioning system with proper amount of new or purified refrigerant TEXT IN ILLUSTRATION *a LO *b HI HINT: For the example above, moisture is present in the air conditioning system. Pressure is low on both low and high pressure sides Symptom Air conditioning system does not cool effectively. Insufficient cooling performance Probable Cause Refrigerant leaks from air conditioning system Diagnosis Insufficient refrigerant Refrigerant leaking Corrective Actions Check for refrigerant leaks and repair if necessary Recharge air conditioning system with proper amount of new or purified refrigerant If gauges indicate pressure of close to 0, then it is necessary to evacuate air conditioning system after repairing leak TEXT IN ILLUSTRATION *a LO *b HI HINT: For the example above, there is insufficient refrigerant. Pressure is low on both low and high pressure sides Symptom Air conditioning system does not cool effectively. Frost exists on pipe from condenser to evaporator unit Probable Cause Refrigerant flow is obstructed by dirt inside pipes of condenser core Diagnosis Condenser is clogged Corrective Actions Replace condenser TEXT IN ILLUSTRATION *a LO *b HI HINT: For the example above, there is poor circulation of refrigerant. Vacuum is indicated on low pressure side and very low pressure is indicated on high pressure side Symptom Air conditioning system does not cool effectively. (System may cool occasionally) Frost or condensation is seen on piping on both sides of receiver/ dryer or expansion valve Probable Cause Refrigerant flow is obstructed by moisture or dirt in air conditioning system Expansion valve is stuck closed Diagnosis Refrigerant does not circulate Corrective Actions Replace expansion valve Replace condenser Evacuate air conditioning system and supply proper amount of new or purified refrigerant TEXT IN ILLUSTRATION *a LO *b HI HINT: For the example above, the refrigerant does not circulate. Pressure is too high on both low and high pressure sides Symptom Air conditioning system does not cool effectively. Probable Cause Unable to develop sufficient performance due to excessive amount of refrigerant Cooling effectiveness of condenser is insufficient Diagnosis Excessive amount of refrigerant in air conditioning system --> excessive refrigerant was added during recharging Cooling effectiveness of condenser is insufficient --> condenser fins are clogged or cooling fan is faulty Corrective Actions Clean condenser Check operation of condenser cooling fan If above two corrective actions are normal, check amount of refrigerant and recharge air conditioning system with proper amount of new or purified refrigerant TEXT IN ILLUSTRATION *a LO *b HI HINT: For the example above, the air conditioning system is overcharged or cooling effectiveness of condenser is insufficient. Pressure is too high on both low and high pressure sides Symptom Air conditioning system does not cool. The low pressure piping is too hot to touch Probable Cause Air in air conditioning system Diagnosis Air present in air conditioning system Insufficient vacuum purging when evacuating air conditioning system Corrective Actions Replace cooler dryer Check compressor oil to see if it is dirty or insufficient Evacuate air conditioning system and recharge it with new or purified refrigerant TEXT IN ILLUSTRATION *a LO *b HI NOTE: These gauge indications occur when the air conditioning system has been left open and then recharged without evacuating the system. HINT: For the example above, air is present in the air conditioning system. Pressure is too high on both low and high pressure sides Symptom Air conditioning system does not cool effectively. Frost or a large amount of condensation on piping on low pressure side Probable Cause Expansion valve may be stuck open or metering refrigerant incorrectly Diagnosis Excessive refrigerant in low pressure piping Expansion valve open too wide Corrective Actions Replace expansion valve TEXT IN ILLUSTRATION *a LO *b HI HINT: For the above example, there is an expansion valve malfunction. Pressure is too high on both low and high pressure sides or pressure is too low on high pressure side Symptom Air conditioning system does not cool effectively. Probable Cause Internal leak in compressor Diagnosis Low compression Leak from a damaged valve or other compressor component Corrective Actions Replace compressor TEXT IN ILLUSTRATION *a LO *b HI HINT: For the above example, there is insufficient compressor compression. Gauge readings (Reference) TEXT IN ILLUSTRATION *a Pressure on low pressure side kPa (kgf/cm 2 , psi) *b Pressure on high pressure side kPa (kgf/cm 2 , psi) *c Blower high zone *d Blower low zone

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1. RECOVER REFRIGERANT FROM AIR CONDITIONING SYSTEM Turn the power switch on (READY). Turn the A/C switch on. Operate the air conditioning with a set temperature of 25°C (77°F) and the blower at low for 10 minutes to circulate the refrigerant. This causes most of the compressor oil from the various components of the air conditioning system to collect in the air conditioning compressor. Turn the power switch off. Recover the refrigerant from the air conditioning system using a refrigerant recovery unit.
2. CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT Perform vacuum purging using a vacuum pump or appropriate equipment. Charge the air conditioning system with refrigerant. Refrigerant type HFC-134a (R134a) TEXT IN ILLUSTRATION *a Sub-cool System *b High Pressure *c Refrigerant Amount *d Standard charge amount *e Charge additional 100 g (3.5 oz.) *f Point where bubbles disappear *g Mean value in proper range *h Overcharged Standard charge amount 450 to 550 g (15.9 to 19.4 oz.) SST: 09985-20010 09985-02010 09985-02050 09985-02060 09985-02070 09985-02080 09985-02090 09985-02110 09985-02130 09985-02140 09985-02150 NOTE: Do not turn the A/C switch on before charging the air conditioning system with refrigerant. Doing so may cause the compressor to work without refrigerant, resulting in overheating of the compressor. The refrigerant amount should be checked by quantity (weight). HINT: Make sure that sufficient refrigerant is available to recharge the system when using a refrigerant recovery unit. Refrigerant recovery units are not always able to recover 100% of the refrigerant from an air conditioning system.
3. WARM UP COMPRESSOR Keep the A/C switch on for at least 2 minutes to warm up the compressor. NOTE: To prevent damage to the compressor, be sure to warm up the compressor when turning the air conditioning on after removing and installing air conditioning system lines (including the compressor).
4. CHECK FOR REFRIGERANT GAS LEAK After recharging the air conditioning system with refrigerant, check for refrigerant leaks using a halogen leak detector. Carry out the test under the following conditions: Power switch off. Secure good ventilation (the halogen leak detector may react to volatile gases which are not refrigerant, such as gasoline vapor and exhaust gas). Repeat the inspection 2 or 3 times. Measure the pressure to make sure that there is some refrigerant remaining in the air conditioning system (pressure when the compressor is off: approx. 392 to 588 kPa (3.9 to 5.9 kgf/cm2, 57 to 85 psi)). Using a halogen leak detector, check for refrigerant leaks from the air conditioning system. TEXT IN ILLUSTRATION *1 Halogen Leak Detector *a Check for Leak If a refrigerant leak is not detected from the drain hose, remove the blower motor control from the cooling unit. Insert the halogen leak detector sensor into the unit and check for a leak. Disconnect the pressure sensor connector and leave it for approximately 20 minutes. Bring the halogen leak detector close to the pressure sensor and check for a leak. HINT: When checking for leaks, the presence of oily dirt at a joint can indicate a leak.

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1. REMOVE ENGINE ROOM SIDE COVER . Refer to «REMOVAL [03/2012 - ] - Step 1»(ref-600612-S34050855142014022400000)
2. REMOVE COOL AIR INTAKE DUCT SEAL . Refer to «REMOVAL [03/2012 - ] - Step 2»(ref-600612-S34050855142014022400000)
3. RECOVER REFRIGERANT FROM AIR CONDITIONING SYSTEM See step 1
4. REMOVE V-BANK COVER SUB-ASSEMBLY . Refer to «REMOVAL [03/2012 - ] - Step 3»(ref-600560-S04080038042014022400000)
5. REMOVE NO. 1 AIR CLEANER INLET . Refer to «REMOVAL [03/2012 - ] - Step 29»(ref-600560-S04080038042014022400000)
6. REMOVE AIR CLEANER CAP WITH AIR CLEANER HOSE . Refer to «REMOVAL [03/2012 - ] - Step 7»(ref-600565-S03651640162014022400000)
7. REMOVE ENGINE UNDER COVER . Refer to «REMOVAL [03/2012 - ] - Step 21»(ref-600560-S04080038042014022400000)
8. DRAIN ENGINE COOLANT . Refer to «REPLACEMENT [03/2012 - ] - Step 4»(ref-600564-S07414681062014022400000)
9. PRECAUTION NOTE: After turning the power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work. Refer to «PRECAUTION [03/2012 - ]»(ref-600412-S33693534232014022400000) .
10. REMOVE LUGGAGE COMPARTMENT FLOOR MAT . Refer to «REMOVAL [03/2012 - ] - Step 1»(ref-600591-S42295782952014022400000)
11. REMOVE LUGGAGE COMPARTMENT TRIM COVER LH . Refer to «REMOVAL [03/2012 - ] - Step 2»(ref-600591-S42295782952014022400000)
12. DISCONNECT CABLE FROM AUXILIARY BATTERY NEGATIVE TERMINAL WARNING: Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system. NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) .
13. REMOVE FRONT WIPER MOTOR Refer to «REMOVAL [03/2012 - ]»(ref-600615-S15217086652014022400000)
14. DISCONNECT AIR CONDITIONING TUBE ASSEMBLY Remove the bolt. Detach the plate as shown in the illustration. TEXT IN ILLUSTRATION *1 Plate Disconnect the air conditioning tube assembly. NOTE: Do not use a screwdriver or similar tool to disconnect the suction hose sub-assembly. Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering. TEXT IN ILLUSTRATION *a Disconnect tube by hand Remove the 2 O-rings from the air conditioning tube assembly.
15. DISCONNECT HEATER WATER OUTLET HOSE A Remove the water hose set. Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water inlet hose A (engine side). Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water outlet hose A (engine side). Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water outlet hose A (unit side).
16. DISCONNECT HEATER WATER INLET HOSE A Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water inlet hose A (unit side).
17. REMOVE FRONT SEAT ASSEMBLY for Luxury Seat Type: Refer to «REMOVAL [03/2012 - ]»(ref-600608-S14483777922014022400000) for Standard Seat Type: Refer to «REMOVAL [03/2012 - ]»(ref-600608-S36428769182014022400000)
18. REMOVE REAR SEAT ASSEMBLY Refer to «REMOVAL [03/2012 - ]»(ref-600608-S42812442942014022400000)
19. REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY Refer to «REMOVAL [03/2012 - ]»(/lexus/gs/iv-2011-2015/remont/exteriorinterior-trim/#interior-panels-trim-service-information)
20. REMOVE AIR DUCT PLUG HINT: Use the same procedure for both air duct plugs. Detach the 4 claws and remove the air duct plug.
21. REMOVE REAR NO. 5 AIR DUCT HINT: Use the same procedure for both rear No. 5 air ducts. Remove the 2 screws and rear No. 5 air duct.
22. REMOVE FRONT FLOOR CARPET ASSEMBLY HINT: It is not necessary to fully remove the floor carpet. Partially remove it so that the instrument panel reinforcement assembly with air conditioning unit assembly can be removed in a later step.
23. REMOVE REAR NO. 4 AIR DUCT Remove the nut or clip. HINT: The rear No. 4 air duct is installed with a nut (90179- 06097) or clip (90467-06124). Detach the 4 claws and remove the rear No. 4 air duct.
24. REMOVE REAR NO. 2 AIR DUCT Remove the nut or clip. HINT: The rear No. 2 air duct is installed with a nut (90179- 06097) or clip (90467-06124). Detach the 4 claws and remove the rear No. 2 air duct.
25. REMOVE REAR NO. 1 AIR DUCT Detach the clamp. Remove the rear No. 1 air duct.
26. REMOVE REAR NO. 3 AIR DUCT Detach the clamp. Remove the rear No. 3 air duct.
27. REMOVE NO. 1 CONSOLE BOX DUCT Remove the 2 clips and No. 1 console box duct.
28. REMOVE NO. 1 AIR DUCT SUB-ASSEMBLY Remove the clip and No. 1 air duct sub-assembly.
29. REMOVE NO. 2 AIR DUCT SUB-ASSEMBLY Remove the screw and No. 2 air duct sub-assembly.
30. REMOVE STEERING COLUMN ASSEMBLY Refer to «REMOVAL [03/2012 - ]»(ref-600607-S16989590012014022400000)
31. REMOVE LOWER DEFROSTER NOZZLE ASSEMBLY Detach the 3 claws and remove the lower defroster nozzle assembly.
32. REMOVE AIR HOSE Remove the air hose.
33. REMOVE AIR CONDITIONING AMPLIFIER ASSEMBLY Refer to «REMOVAL [03/2012 - ]»(ref-600577-S08880567162014022400000)
34. REMOVE QUICK HEATER ASSEMBLY (w/ PTC Heater) See step 3
35. REMOVE INSTRUMENT PANEL REINFORCEMENT ASSEMBLY WITH AIR CONDITIONING UNIT ASSEMBLY Remove the 2 grommets. Remove the 2 bolts. Detach the clamps and disconnect the connectors. Remove the bolts and nuts. Remove the nut. Remove the 6 caps. Remove the 10 bolts. Using a 12 mm hexagon wrench, loosen the 3 collars. Remove the instrument panel reinforcement assembly with air conditioning unit assembly. TEXT IN ILLUSTRATION *1 Cap *2 Collar
36. REMOVE AIR CONDITIONING UNIT Remove the 3 bolts, 2 screws and air conditioning unit. TEXT IN ILLUSTRATION *1 Bolt *2 Screw

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1. REMOVE BLOWER ASSEMBLY Refer to «REMOVAL [03/2012 - ]»(ref-600577-S42597279672014022400000)
2. REMOVE AIR CONDITIONING HARNESS ASSEMBLY Disconnect the connectors. Remove the air conditioning harness assembly as shown in the illustration.
3. REMOVE AIR CONDITIONING TUBE ASSEMBLY Remove the packing. TEXT IN ILLUSTRATION *1 Packing Remove the butyl tape. TEXT IN ILLUSTRATION *1 Butyl Tape Using a 4 mm hexagon wrench, remove the 2 hexagon bolts and air conditioning tube assembly. Remove the 2 O-rings from the air conditioning tube assembly.
4. REMOVE COOLER EXPANSION VALVE Remove the cooler expansion valve.
5. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY Detach the 3 claws and remove the clamp. TEXT IN ILLUSTRATION *1 Clamp Remove the air conditioning radiator assembly as shown in the illustration.
6. REMOVE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 2 screws and No. 1 air conditioning radiator damper servo sub-assembly.
7. REMOVE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (for RH Side) Remove the 2 screws and No. 2 air conditioning radiator damper servo sub-assembly.
8. REMOVE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 3 screws and No. 3 air conditioning radiator damper servo sub-assembly.
9. REMOVE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 3 screws and No. 5 air conditioning radiator damper servo sub-assembly.
10. REMOVE NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 2 screws and No. 7 air conditioning radiator damper servo sub-assembly.
11. REMOVE NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 3 screws and No. 6 air conditioning radiator damper servo sub-assembly.
12. REMOVE NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Remove the 2 screws and No. 4 air conditioning radiator damper servo sub-assembly.
13. REMOVE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (for LH Side) Remove the 2 screws and No. 2 air conditioning radiator damper servo sub-assembly.
14. REMOVE NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY Remove the 5 screws. Detach the 5 claws and remove the air duct. TEXT IN ILLUSTRATION *1 Air Duct - - Remove the No. 1 cooler evaporator sub-assembly. Remove the 2 O-rings from the evaporator.
15. REMOVE COOLER THERMISTOR See step 16

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1. INSTALL COOLER THERMISTOR See step 1
2. INSTALL NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the hose joint. Compressor oil ND-OIL 11 or equivalent Install the 2 O-rings to the No. 1 cooler evaporator sub-assembly. Install the No. 1 cooler evaporator sub-assembly. Attach the 5 claws to install the air duct. Install the 5 screws.
3. INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (for LH Side) Install the No. 2 air conditioning radiator damper servo sub-assembly with the 2 screws.
4. INSTALL NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 4 air conditioning radiator damper servo sub-assembly with the 2 screws.
5. INSTALL NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 6 air conditioning radiator damper servo sub-assembly with the 3 screws.
6. INSTALL NO. 7 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 7 air conditioning radiator damper servo sub-assembly with the 2 screws.
7. INSTALL NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 5 air conditioning radiator damper servo sub-assembly with the 3 screws.
8. INSTALL NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 3 air conditioning radiator damper servo sub-assembly with the 3 screws.
9. INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (for RH Side) Install the No. 2 air conditioning radiator damper servo sub-assembly with the 2 screws.
10. INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Install the No. 1 air conditioning radiator damper servo sub-assembly with the 2 screws.
11. INSTALL HEATER RADIATOR UNIT SUB-ASSEMBLY Install the air conditioning radiator assembly as shown in the illustration. Attach the 3 claws to install the clamp. TEXT IN ILLUSTRATION *1 Clamp
12. INSTALL COOLER EXPANSION VALVE Install the cooler expansion valve.
13. INSTALL AIR CONDITIONING TUBE ASSEMBLY Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the air conditioning tube assembly joint. Compressor oil ND-OIL 11 or equivalent Install the 2 O-rings to the air conditioning tube assembly. Using a 4 mm hexagon wrench, install the 2 hexagon bolts. Torque: 3.5 N*m (36 kgf*cm, 31 in.*lbf) Apply new butyl tape. Install new packing.
14. INSTALL AIR CONDITIONING HARNESS ASSEMBLY Install the air conditioning harness assembly as shown in the illustration. Connect the connectors.
15. INSTALL BLOWER ASSEMBLY Refer to «INSTALLATION [03/2012 - ]»(ref-600577-S34260909432014022400000)

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1. INSTALL AIR CONDITIONING UNIT ASSEMBLY Install the air conditioning unit assembly with the 3 bolts and 2 screws. for bolt Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf) TEXT IN ILLUSTRATION *1 Bolt *2 Screw
2. INSTALL INSTRUMENT PANEL REINFORCEMENT ASSEMBLY WITH AIR CONDITIONING UNIT ASSEMBLY Install the instrument panel reinforcement assembly with air conditioning unit assembly. Using a 12 mm hexagon wrench, tighten the 3 collars. Install the 10 bolts. for bolt A Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf) for bolt B Torque: 21 N*m (214 kgf*cm, 16 ft.*lbf) Install the 6 caps. TEXT IN ILLUSTRATION *1 Cap *2 Collar Install the nut. Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf) Install the bolts and nuts. Attach the clamps and connect the connectors. Install the 2 bolts. Torque: 10 N*m (102 kgf*cm, 7 ft.*lbf) Install the 2 grommets.
3. INSTALL QUICK HEATER ASSEMBLY (w/ PTC Heater) See step 1
4. INSTALL AIR CONDITIONING AMPLIFIER ASSEMBLY Refer to «INSTALLATION [03/2012 - ]»(ref-600577-S25112442352014022400000)
5. INSTALL AIR HOSE Install the air hose.
6. INSTALL LOWER DEFROSTER NOZZLE ASSEMBLY Attach the 3 claws to install the lower defroster nozzle assembly.
7. INSTALL STEERING COLUMN ASSEMBLY Refer to «INSTALLATION [03/2012 - ]»(ref-600607-S09051893692014022400000)
8. INSTALL NO. 2 AIR DUCT SUB-ASSEMBLY Install the No. 2 air duct sub-assembly with the screw.
9. INSTALL NO. 1 AIR DUCT SUB-ASSEMBLY Attach the 2 claws to install the No. 1 air duct sub-assembly with the clip.
10. INSTALL NO. 1 CONSOLE BOX DUCT Install the No. 1 console box duct with the 2 clips.
11. INSTALL REAR NO. 3 AIR DUCT Install the rear No. 3 air duct. Attach the clamp.
12. INSTALL REAR NO. 1 AIR DUCT Install the rear No. 1 air duct. Attach the clamp.
13. INSTALL REAR NO. 2 AIR DUCT Attach the 4 claws to install the rear No. 2 air duct. Install the nut or clip. HINT: The rear No. 2 air duct is installed with a nut (90179- 06097) or clip (90467-06124).
14. INSTALL REAR NO. 4 AIR DUCT Attach the 4 claws to install the rear No. 4 air duct. Install the nut or clip. HINT: The rear No. 4 air duct is installed with a nut (90179- 06097) or clip (90467-06124).
15. INSTALL FRONT FLOOR CARPET ASSEMBLY
16. INSTALL REAR NO. 5 AIR DUCT HINT: Use the same procedure for both rear No. 5 air ducts. Install the rear No. 5 air duct with the 2 screws.
17. INSTALL AIR DUCT PLUG HINT: Use the same procedure for both air duct plugs. Attach the 4 claws to install the air duct plug.
18. INSTALL INSTRUMENT PANEL SAFETY PAD SUB-ASSEMBLY Refer to «INSTALLATION [03/2012 - ]»(/lexus/gs/iv-2011-2015/remont/exteriorinterior-trim/#interior-panels-trim-service-information)
19. INSTALL REAR SEAT ASSEMBLY Refer to «INSTALLATION [03/2012 - ]»(ref-600608-S19623375982014022400000)
20. INSTALL FRONT SEAT ASSEMBLY for Luxury Seat Type: Refer to «INSTALLATION [03/2012 - ]»(ref-600608-S24834631292014022400000) for Standard Seat Type: Refer to «INSTALLATION [03/2012 - ]»(ref-600608-S29648293002014022400000)
21. CONNECT HEATER WATER INLET HOSE A Connect the heater water inlet hose A (unit side) as shown in the illustration. TEXT IN ILLUSTRATION *a Purple Marking *b 90° +/- 15°
22. CONNECT HEATER WATER OUTLET HOSE A Connect the heater water outlet hose A (unit side) and attach the clip. TEXT IN ILLUSTRATION *a Purple Marking *b 45°+/- 15° Connect the heater water outlet hose A (engine side) and attach the clip. TEXT IN ILLUSTRATION *a Blue Marking *b 0°+/- 15° Connect the heater water inlet hose A (engine side) and attach the clip. TEXT IN ILLUSTRATION *a Yellow Marking *b 0°+/- 15° Install the water hose set.
23. CONNECT AIR CONDITIONING TUBE ASSEMBLY Remove the vinyl tape attached to the air conditioning tube assembly. Sufficiently apply compressor oil to a new O-ring and the fitting surface of the air conditioning tube assembly. Compressor oil ND-OIL 11 or equivalent Install the O-ring to the air conditioning tube assembly. Connect the air conditioning tube assembly. NOTE: After the connection, check that the claw of the piping clamp is attached. Attach the plate as shown in the illustration and install the bolt. Torque: 9.8 N*m (100 kgf*cm, 87 in.*lbf) TEXT IN ILLUSTRATION *1 Plate
24. INSTALL FRONT WIPER MOTOR Refer to «INSTALLATION [03/2012 - ]»(ref-600615-S02696819712014022400000)
25. CONNECT CABLE TO AUXILIARY BATTERY NEGATIVE TERMINAL NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected. Refer to «INITIALIZATION [03/2012 - ]»(ref-600412-S41156157812014022400000) .
26. INSTALL LUGGAGE COMPARTMENT TRIM COVER LH . Refer to «INSTALLATION [03/2012 - ] - Step 24»(ref-600591-S24662608162014022400000)
27. INSTALL LUGGAGE COMPARTMENT FLOOR MAT . Refer to «INSTALLATION [03/2012 - ] - Step 26»(ref-600591-S24662608162014022400000)
28. ADD ENGINE COOLANT . Refer to «REPLACEMENT [03/2012 - ] - Step 5»(ref-600564-S07414681062014022400000)
29. CHARGE AIR CONDITIONING SYSTEM WITH REFRIGERANT See step 2
30. WARM UP COMPRESSOR See step 3
31. INSPECT FOR COOLANT LEAK . Refer to «ON-VEHICLE INSPECTION [03/2012 - ] - Step 1»(/lexus/gs/iv-2011-2015/remont/cooling-system-mechanical/#engine-cooling-system-inspection)
32. CHECK FOR REFRIGERANT GAS LEAK See step 4
33. INSTALL NO. 1 AIR CLEANER INLET . Refer to «INSTALLATION [03/2012 - ] - Step 75»(ref-600560-S18093750712014022400000)
34. INSTALL ENGINE UNDER COVER . Refer to «INSTALLATION [03/2012 - ] - Step 115»(ref-600560-S18093750712014022400000)
35. INSTALL V-BANK COVER SUB-ASSEMBLY . Refer to «INSTALLATION [03/2012 - ] - Step 116»(ref-600560-S18093750712014022400000)
36. INSTALL COOL AIR INTAKE DUCT SEAL . Refer to «INSTALLATION [03/2012 - ] - Step 10»(ref-600612-S38699563872014022400000)
37. INSTALL ENGINE ROOM SIDE COVER . Refer to «INSTALLATION [03/2012 - ] - Step 11»(ref-600612-S38699563872014022400000)
38. CHECK SRS WARNING LIGHT Refer to «DIAGNOSIS SYSTEM [03/2012 - ]»(ref-600414-S16656841442014022400000)

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1. REMOVE AIR CONDITIONING UNIT Refer to «REMOVAL [03/2012 - ]»(ref-600577-S00289708082014022400000)
2. REMOVE BLOWER ASSEMBLY Remove the screw. Detach the 3 claws and remove the blower assembly. Disconnect the drain hose. TEXT IN ILLUSTRATION *1 Drain Hose

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1. REMOVE AIR REFINER ELEMENT Detach the 2 claws and remove the air filter sub-assembly. Remove the air refiner element.
2. REMOVE BLOWER WITH FAN MOTOR SUB-ASSEMBLY See step 7
3. REMOVE NO. 1 DAMPER SERVO SUB-ASSEMBLY Remove the 3 screws. Detach the 4 claws and remove the upper blower case. TEXT IN ILLUSTRATION *1 Upper Blower Case Detach the 3 claws and remove the plate. TEXT IN ILLUSTRATION *1 Plate Remove the 2 screws and No. 1 damper servo sub-assembly.

Scheme 127

1. INSTALL NO. 1 DAMPER SERVO SUB-ASSEMBLY Install the No. 1 damper servo sub-assembly with the 2 screws. Set the No. 1 damper servo sub-assembly so that the tooth of the gear engages with the cutout part as shown in the illustration to install the plate. TEXT IN ILLUSTRATION *1 Plate *a Cutout Part Attach the 3 claws to install the plate. Attach the 4 claws to install the upper blower case. Install the 3 screws.
2. INSTALL BLOWER WITH FAN MOTOR SUB-ASSEMBLY See step 1
3. INSTALL AIR REFINER ELEMENT Install the air refiner element. Attach the 2 claws to install the air filter sub-assembly.

See also:
• REMOVAL [03/2012 - ]
• ON-VEHICLE INSPECTION [03/2012 - ] - Step 1
• REMOVAL [03/2012 - ] - Step 4