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The blower and the heater controls and the A/C system do not work |
Probable cause: Climate control unit malfunction
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Blown fuse No. C24 (7.5 A) in the under-dash fuse/relay box |
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Poor ground at G403 |
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Poor or loose connections at the terminals | |
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The A/C compressor clutch and the A/C condenser/radiator fans 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 A/C condenser/radiator fans operate, and the blower and heater controls work |
Probable cause: No power to the A/C compressor clutch
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Blown fuse No. B14 (7.5 A) in the under-hood fuse/relay box |
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Poor or loose connections at the terminals | |
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The A/C condenser/radiator fans do not run at low speed with the A/C on, but the blower and heater controls work normally |
Probable cause: A/C condenser/radiator fan low speed circuit malfunction
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Blown fuse No. B12 (30 A) in the under-hood fuse/relay box |
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Poor ground at G301 |
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Poor or loose connections at the terminals | |
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The A/C condenser/radiator fans do not run at high speed, but do run at low speed with the A/C on |
Probable cause: Malfunction in the fan(s) high speed circuit
Do the following troubleshooting as needed:
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Blown fuses No. B23 (30 A) and No. B31 (7.5 A) in the under-hood fuse/relay box |
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Poor ground at G301 |
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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
Troubleshooting the ECT sensor circuit:
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The A/C compressor clutch cycles rapidly on and off |
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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Radiator and/or A/C condenser fan inoperative |
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Low idle speed | |
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Faulty A/C pressure sensor | |
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Vent temperatures vary by more than 20 °F (11 °C) |
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Probable causes: The recirculation control door or the air mix doors are malfunctioning
Do the following troubleshooting: |
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Probable causes: 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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Insufficient heating |
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Check the engine coolant temperature (ECT) during normal operation with the HDS |
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4. |
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 blower motor unit for obstructions |
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7. |
Check for air leaks around the ducts and vents | |
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