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The blower and the heater controls and the A/C system do not work |
Probable cause: HVAC control unit malfunction
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Blown fuse No. B22 (7.5 A) in the under-dash fuse/relay box |
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Poor ground at G502 |
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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 |
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Probable cause: A/C signal circuit malfunction
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Probable cause: A/C pressure sensor circuit malfunction or evaporator temperature sensor circuit malfunction
Troubleshoot the A/C pressure sensor circuit: |
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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. A27 (7.5 A) in the under-hood fuse/relay box |
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A/C thermal protector has continuity |
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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. A2-11 (20 A) in the under-hood fuse/relay box |
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Poor ground at G302 |
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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 fuse No. A2-10 (20 A) and/or No. A8 (7.5 A) in the under-hood fuse/relay box |
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Poor ground at G302 |
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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:
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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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Insufficient heating (with heater) |
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1. |
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2. |
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3. |
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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5. |
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6. |
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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