Air Conditioning: Diagnosis Scion tC I рестайлинг

PROBLEM SYMPTOMS TABLE

HINT

Inspect the "Fuse" and "Relay" before inspecting the suspected area as shown in the table below.

Inspect each malfunction circuit in numerical order for the corresponding symptom.

If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the A/C amplifier.

Air Conditioning System

AIR CONDITIONING SYSTEM PROBLEM SYMPTOMS CHART

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1. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Disconnect the connector from the air conditioning amplifier assembly. Measure the voltage and resistance according to the value(s) in the table below. VOLTAGE AND RESISTANCE SPECIFICATION Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition GND (A7-12)-Body ground W-B - Body ground Ground for main power supply Always Below 1 ohms IG (A7-20) - GND (A7-12) P - W-B Power source (IG) Ignition switch: ON 10 to 14 V +B (A7-40) - GND (A7-12) V - W-B Power source (Backup) Always 10 to 14 V If the results are not as specified, inspect the circuits connected to the other parts. Connect the connector to the air conditioning amplifier assembly. Measure the voltage and resistance according to the value(s) in the table below. VOLTAGE AND RESISTANCE SPECIFICATION Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition AOF (A7-1) - GND (A7-12) W - W-B Air vent mode control servo motor operation voltage Ignition switch: ON Mode switch: DEF 10 to 14 V Ignition switch: ON Mode switch: FACE Below 1 V AOD (A7-2) - GND (A7-12) LG - W-B Air vent mode control servo motor operation voltage Ignition switch: ON Mode switch: FACE 10 to 14 V Ignition switch: ON Mode switch: DEF Below 1 V REC (A7-3) - GND (A7-12) L - W-B Air inlet control servo motor operation voltage Ignition switch: ON R/F switch: FRESH 10 to 14 V Ignition switch: ON R/F switch: RECIRCULATION Below 1 V FRS (A7-4) - GND (A7-12) R- W-B Air inlet control servo motor operation voltage Ignition switch: ON R/F switch: RECIRCULATION 10 to 14 V Ignition switch: ON R/F switch: FRESH Below 1 V RrDEF (A7-5) - GND (A7-12) P - W-B Rear defogger relay signal Ignition switch: ON DEF switch: OFF 10 to 14 V Ignition switch: ON DEF switch: ON Below 1 V MGC (A7-6) - GND (A7-12) BR - W-B Magnetic clutch relay operation signal Ignition switch: ON Magnetic clutch: OFF 10 to 14 V Ignition switch: ON Magnetic clutch: ON Below 1 V BLC (A7-9) - GND (A7-12) L - W-B Blower motor speed control signal Ignition switch: ON Blower switch: ON Pulse generation (See 1 waveform 1) AC1 (A7-10) - GND (A7-12) P - W-B Magnetic clutch signal Ignition switch: ON Magnetic clutch: OFF 10 to 14 V Ignition switch: ON Magnetic clutch: ON Below 1 V FrHR (A7-11) - GND (A7-12) BR - W-B A/C switch relay signal Ignition switch: ON Blower switch: LO A/C switch: OFF 10 to 14 V Ignition switch: ON Blower switch: LO A/C switch: ON Below 1 V GND (A7-12) - Body ground W-B - Body ground Ground for main power supply Always Below 1 ohms TP (A7-13) - GND (A7-12) B - W-B Air vent mode control servo motor position signal Ignition switch: ON Set temperature switch: MAXHOT --> MAXCOOL 0.7 to 4.3 V S5-TP (A7-14) - SG-TP (A7-30) V - Y Power supply for air mix control servo motor Ignition switch: ON 4.5 to 5.5 V ACT (A7-16) - GND (A7-12) LG - W-B Magnetic clutch ON permission signal Ignition switch: ON Magnetic clutch: OFF 10 to 14 V Ignition switch: ON Magnetic clutch: ON Below 1 V ILL- (A7-17) - GND (A7-12) W - W-B Ground for illumination Ignition switch: ON Below 1 n SPD (A7-18) - GND (A7-12) O - W-B Vehicle speed signal Ignition switch: ON Turn front wheel slowly Pulse generation (See 2 waveform 2) ILL+ (A7-19) - ILL- (A7-17) R - W Power supply for illumination Ignition switch: ON Light control switch: OFF 10 to 14 V Ignition switch: ON Light control switch: ON Below 1 V IG (A7-20) - GND (A7-12) P - W-B Power source (IG) Ignition switch: ON 10 to 14 V AMC (A7-21) - GND (A7-12) G - W-B Air mix control servo motor operation voltage Ignition switch: ON Set temperature switch: MAXCOOL 10 to 14 V Ignition switch: ON Set temperature switch: MAXHOT Below 1 V AMH (A7-22) - GND (A7-12) GR - W-B Air mix control servo motor operation voltage Ignition switch: ON Set temperature switch: MAXHOT 10 to 14 V Ignition switch: ON Set temperature switch: MAXCOOL Below 1 V TAM (A7-23) - GND (A7-12) P - W-B A/C ambient temperature sensor signal Ignition switch: ON Ambient temperature: 25°C (77°F) 1.35 to 1.75 V Ignition switch: ON Ambient temperature: 40°C(104°F) 0.85 to 1.25 V TE (A7-24) - GND (A7-12) LG - W-B Evaporator temperature sensor signal Ignition switch: ON Evaporator temperature: 0°C (32°F) 2.0 to 2.4 V Ignition switch: ON Evaporator temperature: 15°C (59°F) 1.4 to 1.8 V HAZ (A7-25) - GND (A7-12) O - W-B Hazard switch signal Hazard switch: OFF 10 to 14 V Hazard switch: ON Below 1 V SECU (A7-27) - GND (A7-12) B - W-B Security indicator signal Security indicator comes on or blink (when theft deterrent system and engine immobilizer system is set) 10 to 14 V Security indicator does not come on Below 1 V SG-TPM (A7-29) - Body ground G - Body ground Ground for air vent mode control servo motor Always Below 1 ohms SG-TP (A7-30) - Body ground Y - Body ground Ground for air mix control servo motor Always Below 1 ohms SG-TAM(A7-31) - Body ground B - Body ground Ground for ambient temperature sensor Always Below 1 ohms SG-TE (A7-32) - Body ground B - Body ground Ground for evaporator temperature sensor Always Below 1 ohms TPM (A7-33) - GND (A7-12) V - W-B Air vent mode control servo motor position signal Ignition switch; ON Mode switch: FACE --> DEF 0.7 to 4.3 V S5-TPM (A7-34) - SG-TPM (A7-29) L - G Air vent mode control servo motor position signal Ignition switch: ON 10 to 14 V A/BON (A7-35) - GND (A7-12) Y - W-B Passenger airbag ON indicator signal Ignition switch: ON Passenger airbag ON indicator comes on 10 to 14 V Ignition switch: ON Passenger airbag ON indicator does not comes on Below 1 V A/B OFF (A7-36) - GND (A7-12) BR - W-B Passenger airbag OFF indicator signal Ignition switch: ON Passenger airbag OFF indicator comes on 10 to 14 V Ignition switch: ON Passenger airbag OFF indicator does not comes on Below 1 V PRS (A7-37) - GND (A7-12) G - W-B Pressure switch signal Ignition switch: START Refrigerant pressure: Normally Below 1 V Ignition switch: START Refrigerant pressure: Less than 0.19 MPa (2.0 kgf/ cm 2 , 28 psi) or more than 1.34 MPa (13.7 kgf/cm 2 , 195 psi) 10 to 14 V SEAT (A7-38) - IG (A7-20) P - P Passenger seat belt warning light signal Ignition switch: ON Passenger seat belt warning comes on 10 to 14 V Ignition switch: ON Passenger seat belt warning does not comes on Below 1 V +B (A7-40) - GND (A7-12) V - W-B Power source (Backup) Always 10 to 14 V Waveform 1: Measure the waveform between terminals A7-9 (BLC) and A7-12 (GND). OK: A waveform should be output as shown in the illustration. HINT: Waveform cycle varies with the blower level. Waveform 2: Measure the waveform between terminals A7-9 (BLC) and A7-12 (GND). OK: A waveform should be output as shown in the illustration. HINT: As vehicle speed increases, the cycle of the signal waveform becomes narrow.

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1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This method uses a manifold gauge set to locate problem areas. Read the manifold gauge pressure when these conditions are established. Test conditions: Temperature at the air inlet is 30 to 35°C (86 to 95°F). Engine is running at 1,500 rpm. All doors are fully open. Blower speed control switch is at HI. Temperature control switch is at MAX COOL. A/C switch is ON. Gauge readings (Reference) Normally functioning refrigeration system Gauge reading GAUGE READING REFERENCE Pressure side Refrigerant volume Low 0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm 2 ) High 1.37 to 1.57 MPa (14 to 16 kgf/cm 2 ) The A/C system periodically changes between normal and improper function due to moisture in the refrigerant system. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions During operation, pressure on low-pressure side cycles between normal and vacuum Moisture in refrigeration system freezes at expansion valve orifice, causing temporary stop of cycle. However, when melted, normal state is restored Drier is overly saturated Moisture in refrigeration system freezes at expansion valve orifice and blocks refrigerant circulation Replace cooler drier Remove moisture from cycle by repeatedly evacuating air Supply appropriate volume of new refrigerant The A/C system does not function effectively due to insufficient cooling. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure low on both low and high-pressure sides Cooling performance insufficient Gas leakage from refrigeration system Insufficient refrigerant Refrigerant leakage Check for gas leakage and repair if necessary Supply appropriate volume of new refrigerant If indicated pressure value close to 0 when connected to gauge, create vacuum after inspecting and repairing the location of leakage The A/C system does not function effectively due to poor circulation of the refrigerant. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure low on both low and high-pressure sides Frost exists on piping from condenser to A/C unit Refrigerant flow obstructed by dirt in condenser Condenser clogged Replace condenser The A/C system does not function intermittently because the refrigerant does not circulate. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Vacuum indicated on low-pressure side, and extremely low pressure indicated on high-pressure side Frost or condensation seen on piping on both sides of condenser or expansion valve Refrigerant flow obstructed by moisture or dirt in refrigeration system Refrigerant flow obstructed by gas leakage from expansion valve Refrigerant does not circulate Check expansion valve Clean expansion valve by blowing air Replace condenser Evacuate air and charge appropriate volume of new refrigerant For gas leakage from expansion valve, replace expansion valve The A/C system does not function effectively due to overcharged refrigerant or insufficient cooling of the condenser. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Excessive refrigerant Cooling performance of condenser insufficient Condenser is dirty Condenser fan motor is malfunctioning Excessive refrigerant Clean condenser Check condenser fan motor operation If 1 and 2 normal, check the amount of refrigerant and supply appropriate volume of refrigerant The A/C system does not function due to air in the refrigeration system. CAUTION: The low-pressure piping may be very hot and cause serious burns. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Low-pressure piping is too hot to touch Air in refrigeration system Air in refrigeration system Vacuum purging insufficient Check if compressor oil is dirty or insufficient Evacuate air and charge new refrigerant The A/C system does not function effectively due to an expansion valve malfunction. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Frost or condensation on piping on low-pressure side Problem with expansion valve Excessive refrigerant in low pressure piping Expansion valve too wide open Replace expansion valve The A/C system does not function due to a defective compressor. PROBLEM SYMPTOMS CHART Symptoms Probable Cause Diagnosis Corrective Actions Pressure extremely high on both low and high-pressure sides Pressure extremely low on high-pressure side Internal leakage in compressor Compression failure Leakage from damaged valve or broken sliding parts Repair or replace compressor

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1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM Start up the engine. A/C switch is ON. Operate the cooler compressor with an engine speed of approximately 1,000 rpm for 5 to 6 minutes to circulate the refrigerant and collect the compressor oil remaining in each component into the cooler compressor. Stop the engine. Recover the refrigerant from the A/C system using a refrigerant recovery unit.
2. CHARGE REFRIGERANT Perform vacuum purging using a vacuum pump. Charge refrigerant HFC-134a (R134a). Standard: 430+-30g(15.2+-1.1 oz.) SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080) NOTE: Do not operate the cooler compressor before charging refrigerant as the cooler compressor will not work properly without any refrigerant, and will overheat. Approximately 100 g (3.53 oz.) of refrigerant may need to be charged after bubbles disappear. The refrigerant amount should be checked by measuring its quantity, and not with the sight glass.
3. WARM UP ENGINE Warm up the engine at less than 1,850 rpm for 2 minutes or more after charging the refrigerant. NOTE: Be sure to warm up the compressor when turning the A/C switch ON after removing and installing the cooler refrigerant lines (including the compressor), to prevent damage to the compressor.
4. INSPECT FOR REFRIGERANT LEAK After recharging with refrigerant gas, inspect for refrigerant leak gas using a halogen leak detector. Carry out the test under the following conditions: IG OFF Secure good ventilation (the gas leak detector may 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 the compressor is off: approx. 392 to 588 kPa (4 to 6 kgf/cm 2 , 57 to 85 psi) Using a gas leak detector, inspect for refrigerant leak from the refrigerant lines.. Bring the gas leak detector close to the drain hose with the detector's power off, and then turn the detector on. NOTE: After the blower motor has stopped, let the cooling unit stand for more than 15 minutes. Bring 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 it is not possible to avoid interference from volatile gases, the vehicle should be lifted up to allow testing. If a gas leak is not detected from the drain hose, remove the blower motor control from the cooling unit. Insert the gas leak detector sensor into the unit and perform the test. Disconnect the pressure switch connector and leave it for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and perform the test.

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
2. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
3. DISCONNECT NO. 1 COOLER REFRIGERANT SUCTION HOSE Install SST on the piping clamp. SST 09870-00025 HINT: Confirm the correct direction of the piping clamp claw and SST by checking the illustration on the caution label. Push down SST and release the clamp lock. NOTE: Be careful not to deform the tube when pushing SST. Pull SST slightly and push the release lever, and then remove the piping clamp with SST. Disconnect the cooler refrigerant suction hose. NOTE: Do not use a screwdriver or similar tool to disconnect the hose. Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering them. Remove the 2 O-rings from the cooler refrigerant suction hose.
4. DISCONNECT COOLER REFRIGERANT LIQUID PIPE SST 09870-00015 HINT: Disconnection of the cooler refrigerant liquid pipe is the same as for the cooler refrigerant suction hose.
5. DISCONNECT HEATER WATER INLET HOSE Using pliers, grip the claws of the clip and slide the clip. Disconnect the heater water inlet hose.
6. DISCONNECT HEATER WATER OUTLET HOSE HINT: Disconnection of the heater water outlet hose is the same as for the heater water inlet hose.
7. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY UPPER Remove the instrument panel sub-assembly upper (see «REMOVAL»(ref-296246-S03403041552008082200000) ).
8. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY LOWER Remove the instrument panel sub-assembly lower (see «REMOVAL»(ref-296246-S15653323792008082200000) ).
9. REMOVE ECM (See «REMOVAL»(/scion/tc/i-2007-2010/remont/removal-installation/#engine-control-system-2az-fe) )
10. REMOVE NO. 3 HEATER TO REGISTER DUCT Remove the 2 clips. Detach the 2 claws and remove the heater to register duct.
11. REMOVE DEFROSTER NOZZLE ASSEMBLY LOWER Detach the 2 claws and remove the defroster nozzle assembly lower.
12. REMOVE INSTRUMENT PANEL TO COWL BRACE CENTER Remove the 2 bolts and instrument panel to cowl brace center.
13. REMOVE INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY Remove the clip and fold the floor carpet back. Disconnect the 4 clamps and disconnect the wire harness. Remove the bolt and disconnect the ground wire. Disconnect the 2 clamps and disconnect the wire harness. Detach the 2 claws and disconnect the connector. Remove the 3 bolts, nut, screw and instrument panel to cowl brace sub-assembly.
14. REMOVE NO. 2 INSTRUMENT PANEL BRACE SUB-ASSEMBLY Disconnect the 2 clamps and separate the wire harness. Disconnect the clamp and separate the antenna cord sub-assembly. Remove the bolt, nut and instrument panel brace.
15. REMOVE AIR DUCT Remove the connectors from the air duct and disconnect the connector. Remove the screw. Detach the 2 claws and remove the air duct.
16. REMOVE BLOWER ASSEMBLY (See «REMOVAL»(ref-296255-S25447216122008082200000) )
17. REMOVE AIR CONDITIONING RADIATOR ASSEMBLY Remove the 2 connectors. Remove the 2 nuts and the air conditioning radiator.

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1. REMOVE NO. 1 COOLER UNIT DRAIN HOSE Remove the cooler unit drain hose.
2. REMOVE AIR DUCT Detach the 2 claws and remove the air duct.
3. REMOVE AIR OUTLET CONTROL SERVO MOTOR Remove the 3 screws and air outlet control servo motor.
4. REMOVE AIR MIX CONTROL SERVO MOTOR Remove the 2 screws and air mix control servo motor.
5. REMOVE HEATER PIPING COVER Detach the 3 claws and remove the heater piping cover.
6. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY Detach the 3 claws and remove the clamp. Remove the heater radiator unit.
7. REMOVE AIR CONDITIONING TUBE ASSEMBLY Remove the 2 screws. Detach the claw and remove the cover. Using a 4 mm hexagon wrench, remove the 2 hexagon bolts and air conditioning tube. Remove the 2 O-rings from the air conditioning tube.
8. REMOVE COOLER EXPANSION VALVE Remove the cooler expansion valve from the cooler evaporator.
9. REMOVE EVAPORATOR TEMPERATURE SENSOR Remove the 2 screws and plate. Remove the 7 screws, cooler evaporator and evaporator temperature sensor. Remove the evaporator temperature sensor from the cooler evaporator.
10. REMOVE EVAPORATOR SUB-ASSEMBLY Remove the 2 O-rings from the cooler evaporator.

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1. INSTALL COOLER EVAPORATOR SUB-ASSEMBLY Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the cooler evaporator. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings on the cooler evaporator.
2. INSTALL EVAPORATOR TEMPERATURE SENSOR Install the evaporator temperature sensor as shown in the illustration. Check that the sensor sticks to the evaporator surface as shown in the illustration (A: Sensor, B: Evaporator). NOTE: If reusing the evaporator, DO NOT insert the sensor to the position that it had been inserted before. Insert it between position C shown in the illustration. Install the cooler evaporator on the heater case with the 7 screws. Install the plate with the 2 screws.
3. INSTALL COOLER EXPANSION VALVE Install the cooler expansion valve to the cooler evaporator.
4. INSTALL AIR CONDITIONING TUBE ASSEMBLY Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the air conditioning tube. Compressor oil: ND-OIL 8 or equivalent Using a 4 mm hexagon wrench, install the air conditioning tube with the 2 hexagon bolts. Torque: 3.5 N*m (35 kgf*cm, 30 in.*lbf) Install the cover with the claw and 2 screws.
5. INSTALL HEATER RADIATOR UNIT SUB-ASSEMBLY Install the heater radiator unit. Attach the 3 claws and install the clamp.
6. INSTALL HEATER PIPING COVER Attach the 3 claws and install the heater piping cover.
7. INSTALL AIR MIX CONTROL SERVO MOTOR Install the air mix control servo motor with the 2 screws.
8. INSTALL AIR OUTLET CONTROL SERVO MOTOR Install the air outlet control servo motor with the 3 screws.
9. INSTALL AIR DUCT Attach the 2 claws and install the air duct.
10. INSTALL NO. 1 COOLER UNIT DRAIN HOSE Install the cooler unit drain hose.

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1. INSTALL AIR CONDITIONING RADIATOR ASSEMBLY Temporarily tighten the air conditioning radiator with the 2 nuts. Connect the 2 connectors.
2. INSTALL BLOWER ASSEMBLY (See «INSTALLATION»(ref-296255-S33609774952008082200000) )
3. INSTALL AIR CONDITIONING UNIT ASSEMBLY Fully tighten the air conditioner unit with the bolt, screw and 2 nuts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf) NOTE: Tighten in the order indicated in the illustration.
4. INSTALL AIR DUCT Attach the 2 claws and install the air duct. Install the screw. Connect the connector and install the connector to the air duct.
5. INSTALL NO. 2 INSTRUMENT PANEL BRACE SUB-ASSEMBLY Install the instrument panel brace with the bolt and nut. Install the antenna cord and attach the clamp. Install the wire harness and attach the 2 clamps.
6. INSTALL INSTRUMENT PANEL TO COWL BRACE SUB-ASSEMBLY Install the instrument panel to cowl brace with the 3 bolts and nut. Attach the 2 claws to install the connector. Install the wire harness and attach the 2 clamps. Install the ground wire with the bolt. Install the wire harness and attach the 4 clamps. Reposition the floor carpet and install the clip.
7. INSTALL INSTRUMENT PANEL TO COWL BRACE CENTER Install the instrument panel to cowl brace center with the 2 bolts.
8. INSTALL DEFROSTER NOZZLE ASSEMBLY LOWER Attach the 2 claws and install the defroster nozzle assembly lower.
9. INSTALL NO. 3 HEATER TO REGISTER DUCT Attach the 2 claws and install the heater to register duct. Install the 2 clips.
10. INSTALL ECM (See «INSTALLATION»(/scion/tc/i-2007-2010/remont/removal-installation/#engine-control-system-2az-fe) )
11. INSTALL INSTRUMENT PANEL LOWER ASSEMBLY Install the instrument panel lower assembly (see «INSTALLATION»(ref-296246-S01920082712008082200000) ).
12. INSTALL INSTRUMENT PANEL SUB-ASSEMBLY UPPER Install the instrument panel sub-assembly upper (see «INSTALLATION»(ref-296246-S19366412192008082200000) ).
13. CONNECT HEATER WATER OUTLET HOSE Connect the water hose and attach the clip.
14. CONNECT HEATER WATER INLET HOSE HINT: Use the same procedures described for the water hose.
15. INSTALL COOLER REFRIGERANT LIQUID PIPE Remove the attached vinyl tape from the pipe. Sufficiently apply compressor oil to new 2 O-rings and the fitting surface of the cooler refrigerant liquid pipe A. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings on the cooler refrigerant liquid pipe. Install the cooler refrigerant liquid pipe and piping clamp. HINT: After the connection, check that the claw of the piping clamp is engaged.
16. INSTALL NO. 1 COOLER REFRIGERANT SUCTION HOSE Remove the attached vinyl tape from the pipe. Sufficiently apply compressor oil to new 2 O-rings and the fitting surface of the cooler refrigerant suction hose. Compressor oil: ND-OIL 8 or equivalent Install the 2 O-rings on the cooler refrigerant suction hose. Install the cooler refrigerant suction hose and the piping clamp. HINT: After the connection, check that the claw of the piping clamp is engaged.
17. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
18. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION»(ref-296226-S09190278172008082200000) ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
19. INSPECT SRS WARNING LIGHT Check the SRS warning light (see «DIAGNOSIS SYSTEM»(/scion/tc/i-2007-2010/remont/airbag/#supplemental-restraint-system) ).
20. ADD ENGINE COOLANT (See «ON-VEHICLE INSPECTION»(ref-296235-S08215383142008082200000) )
21. CHARGE REFRIGERANT (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
22. WARM UP ENGINE (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
23. INSPECT FOR ENGINE COOLANT LEAK (See «ON-VEHICLE INSPECTION»(ref-296235-S22380392102008082200000) )
24. INSPECT FOR REFRIGERANT LEAK (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
2. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY UPPER Remove the instrument panel sub-assembly upper (see «REMOVAL»(ref-296246-S03403041552008082200000) ).
3. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY LOWER Remove the instrument panel sub-assembly lower (see «REMOVAL»(ref-296246-S15653323792008082200000) ).
4. REMOVE ECM (See «REMOVAL»(/scion/tc/i-2007-2010/remont/removal-installation/#engine-control-system-2az-fe) )
5. REMOVE AIR DUCT (See «REMOVAL»(ref-296255-S15571277472008082200000) )
6. REMOVE BLOWER ASSEMBLY Disconnect the 3 connectors. Remove the 3 screws and bolt. Detach the claw and remove the blower in the order shown in the illustration.

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1. REMOVE AIR FILTER CASE Detach the 2 claws and remove the air filter case.
2. REMOVE AIR INLET SERVO MOTOR Remove the 2 screws and air inlet servo motor.
3. REMOVE BLOWER MOTOR CONTROL Remove the 2 screws and blower motor control.
4. REMOVE BLOWER WITH FAN MOTOR SUB-ASSEMBLY Remove the 3 screws and blower w/ fan motor.

ON-VEHICLE INSPECTION

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

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1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
2. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
3. DISCONNECT NO. 1 COOLER REFRIGERANT DISCHARGE HOSE Remove the bolt and disconnect the cooler refrigerant discharge hose from the cooler condenser. Remove the O-ring from the cooler refrigerant discharge hose. NOTE: Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering them.
4. DISCONNECT COOLER REFRIGERANT LIQUID PIPE Remove the 2 bolts and disconnect the cooler refrigerant liquid pipe from the cooler condenser. Remove the O-ring from the cooler refrigerant liquid pipe. NOTE: Seal the openings of the disconnected parts using vinyl tape to prevent moisture and foreign matter from entering them.
5. REMOVE RADIATOR SUPPORT UPPER BRACKET Remove the 2 bolts and 2 brackets.
6. REMOVE HOOD LOCK ASSEMBLY Remove the 3 bolts and hood lock.
7. REMOVE LOW PITCHED HORN ASSEMBLY (See «REMOVAL»(ref-296263-S04026318792008082200000) )
8. REMOVE HIGH PITCHED HORN ASSEMBLY (See «REMOVAL»(ref-296263-S30171142362008082200000) )
9. REMOVE RADIATOR SUPPORT UPPER Remove the 5 bolts, 2 nuts and radiator support upper.
10. REMOVE COOLER CONDENSER ASSEMBLY Remove the cooler condenser.

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1. INSTALL COOLER CONDENSER ASSEMBLY Install the cooler condenser. 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
2. INSTALL RADIATOR SUPPORT UPPER Install the radiator support upper with the 5 bolts and 2 nuts. Torque: 9.8 N*m (100 kgf*cm, 7 ft.*lbf)
3. INSTALL HIGH PITCHED HORN ASSEMBLY (See «INSTALLATION»(ref-296263-S17846231122008082200000) )
4. INSTALL LOW PITCHED HORN ASSEMBLY (See «INSTALLATION»(ref-296263-S07610074552008082200000) )
5. INSTALL HOOD LOCK ASSEMBLY Install the hood lock with the 3 bolts.
6. INSTALL RADIATOR SUPPORT UPPER BRACKET Install the 2 brackets with the 2 bolts. Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf)
7. INSTALL COOLER REFRIGERANT LIQUID PIPE Remove the attached vinyl tape from the pipe and the connecting part of the cooler condenser. 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 cooler refrigerant liquid pipe. Install the cooler refrigerant liquid pipe on the cooler condenser with the 2 bolts. Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf)
8. INSTALL NO. 1 COOLER REFRIGERANT DISCHARGE HOSE Remove the attached vinyl tape from the hose and the connecting part of the cooler condenser. 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 cooler refrigerant discharge hose. Install the cooler refrigerant discharge hose on the cooler condenser with the bolt. Torque: 5.4 N*m (55 kgf*cm, 47 in.*lbf)
9. ADJUST HOOD SUB-ASSEMBLY (See «ADJUSTMENT»(ref-296249-S08612373812008082200000) )
10. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
11. PERFORM INITIALIZATION Perform initialization (see «INITIALIZATION»(ref-296226-S09190278172008082200000) ). NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
12. CHARGE REFRIGERANT (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
13. WARM UP ENGINE (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )
14. INSPECT FOR REFRIGERANT LEAK (See «REPLACEMENT»(ref-296255-S03425958222008082200000) )

Scheme 74

1. INSPECT AMBIENT TEMPERATURE SENSOR Disconnect the A6 ambient temperature sensor connector. Measure the resistance between terminals 1 and 2 of the A/C ambient temperature sensor at each temperature, as shown in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Condition Specified Condition A6-1 - A6-2 10°C (50°F) 3.00 to 3.73 kohms 15°C (59°F) 2.45 to 2.88 kohms 20°C (68°F) 1.95 to 2.30 kohms 25°C (77°F) 1.60 to 1.80 kohms 30°C (86°F) 1.28 to 1.47 kohms 35°C (95°F) 1.00 to 1.22 kohms 40°C(104°F) 0.80 to 1.00 kohms 45°C(113°F) 0.65 to 0.85 kohms 50°C (122°F) 0.50 to 0.70 kohms 55°C (131°F) 0.44 to 0.60 kohms 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 almost the same as the ambient temperature. HINT: As the temperature increases, the resistance decreases (see the graph ). If the resistance value is not as specified, replace the sensor.

Scheme 75

See also:
• REMOVAL
• DIAGNOSIS SYSTEM
• REMOVAL