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The blower motor does not run at all |
Probable cause: A problem in the blower motor power or ground circuit
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Blown fuses No. C24 (7.5 A) in the under-dash fuse/relay box and No. D3 (30 A) in the auxiliary under-dash fuse box |
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Faulty blower motor relay |
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Faulty heater fan switch |
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Poor ground at G403 |
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Poor or loose connections at the terminals | |
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The blower motor runs, but one or more speeds are inoperative |
Probable cause: A problem in the circuits between the heater fan switch and the blower resistor
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Faulty blower resistor |
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Faulty heater fan switch |
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Poor or loose connections at the terminals | |
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The blower motor runs with the heater fan switch off |
Probable cause: A short in the blower motor ground circuit
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Faulty heater fan switch |
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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
Do the A/C pressure sensor circuit:
NOTE: The A/C pressure sensor can malfunction without setting a DTC |
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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 fan and/or the radiator fan do not run with the A/C on |
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 |
Probable cause: Malfunction in the fan high speed circuit(s)
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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Faulty PGM-FI main relay 1 |
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Faulty electronic throttle control system (ETCS) control relay |
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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 compressor clutch cycles rapidly on and off |
Probable cause: A/C system is very low on refrigerant, indicating a possible leak
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Check low idle first, then check data list 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 clutch circuit, then replace the relief valve |
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Poor or loose connections at the terminals | |
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The A/C compressor relief valve has vented refrigerant
NOTE: This indicates the A/C system pressure was very high |
Probable cause: A high-side restriction, the A/C condenser/radiator fans are inoperative, or the A/C compressor clutch is not disengaging
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If the A/C compressor clutch will not disengage, troubleshoot the A/C compressor clutch: |
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If the fans and A/C compressor clutch operate normally, recover refrigerant, and check for restrictions | |
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Poor or loose connections at the terminals | |
