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The blower and the heater controls and the A/C system do not work |
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Blown fuse No. D9 (10 A) in the under-dash fuse/relay box |
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Poor ground at G402 |
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Poor or loose connections at the terminals | |
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The A/C compressor clutch and the cooling fan are inoperative, but the blower and heater controls work |
Probable cause: A/C pressure sensor circuit malfunction or evaporator temperature sensor circuit malfunction
Troubleshoot the A/C pressure sensor circuit:
NOTE: The A/C pressure sensor circuit can malfunction without setting a DTC |
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Faulty evaporator temperature sensor |
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Poor or loose connections at the terminals | |
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The A/C compressor clutch does not engage, but the cooling fan operate, and the blower and heater controls work |
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Blown fuse No. A23 (10 A) in the under-hood fuse/relay box |
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Poor or loose connections at the terminals | |
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Blower fan runs slower than expected in cold weather (when in AUTO mode)
NOTE: It is normal for the blower fan to run slowly until the coolant temperature rises when in AUTO mode |
Probable cause: Engine coolant temperature (ECT) circuit malfunction
Troubleshoot the ECT sensor circuit:
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The A/C compressor clutch cycles rapidly on and off*6 |
Probable cause:
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A/C system is overcharged (Excessive pressure on high side of system causing pressure sensor to turn A/C compressor off) |
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Cooling fan inoperative |
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Low idle speed |
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Evaporator temperature sensor malfunction
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Faulty A/C pressure sensor | |
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The A/C compressor clutch does not disengage when the A/C switch is off |
Probable cause: The A/C compressor clutch circuit is on (energized) continuously, shorted to ground, stuck A/C compressor clutch relay, or the A/C compressor clutch is mechanically jammed
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The A/C compressor relief valve. If it has vented refrigerant to the atmosphere, correct the problem with the A/C compressor clutch or the A/C compressor clutch circuit, then replace the A/C compressor relief valve |
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The A/C compressor relief valve has vented refrigerant
NOTE: This indicates the A/C system high side pressure was high |
Probable cause: A high-side restriction, the cooling fan is inoperative, or the A/C compressor clutch is not disengaging
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If the fans and A/C compressor clutch operate normally, feel the lines for restrictions
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If the A/C condenser/radiator fans are inoperative, troubleshoot the fan circuits | |
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Driver's and passenger's side vent temperatures vary by more than 11 °C (20 °F) |
Probable cause:
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The air mix doors are malfunctioning
Do the following troubleshooting: |
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Low refrigerant charge |
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Poor or loose connections at the terminals | |
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HDS does not communicate with the climate control unit or the vehicle |
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A/C information does not display on the center display unit, but the blower, heater and A/C system controls work (climate control panel without display) |
Probable cause: Communication malfunction between the audio unit*1 or the audio-navigation unit*2 and the climate control unit
Check the B-CAN line between the audio unit*1 or the audio-navigation unit*2 and the climate control unit |
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Insufficient heating |
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Check the engine coolant temperature (ECT) during normal operation with the HDS |
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Check the heater core inlet hose temperature: |
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If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, or a damaged or leaking water pump |
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Check the operation of the air mix doors: |
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Driver's air mix control motor test*4 |
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Check the blower motor unit for obstructions |
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7. |
Check for air leaks around the ducts and vents | |
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