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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING TABLE

Symptom Diagnostic procedure Also check for
The blower motor does not run at all
  • Blown fuse No. 10 (7.5 A) or No. 57 (30 A) in the under-dash fuse/relay box
  • Faulty blower motor relay
  • Faulty heater fan switch
  • Poor ground at G501 (seepage 22-30)
  • Poor ground at G502: With navigation (see CONNECTOR TO FUSE/RELAY BOX INDEX ), Without navigation (see CONNECTOR TO FUSE/RELAY BOX INDEX )
  • Poor or loose connections at the terminals
The blower motor runs, but one or more speeds are inoperative
  • Faulty blower resistor
  • Faulty blower fan switch
  • Poor or loose connections at the terminals
T blower motor runs with the fan switch off
  • Faulty heater fan switch
  • Poor or loose connections at the terminals
The A/C compressor clutch and the A/C condenser/radiator fans are inoperative, but the blower and heater controls work
The A/C compressor clutch does not engage, but the A/C condenser/radiator fans operate, and the blower and heater controls work
  • Blown fuse No. 43 (7.5 A) in the under-dash fuse/relay box
  • A/C system pressure is normal (see A/C SYSTEM TEST  )
  • A/C thermal protector has continuity (see A/C COMPRESSOR CLUTCH CHECK  )
  • Faulty heater fan switch
  • Poor or loose connections at the terminals
The A/C condenser fan, or the radiator fan (or both) are inoperative with the A/C on
The A/C compressor clutch cycles rapidly on and off If there is no leak and the refrigerant level is normal, do A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING  and look for an intermittent problem
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, or the compressor clutch is mechanically jammed
  • The A/C compressor relief valve. If it has vented refrigerant to the atmosphere, correct the problem with the compressor clutch or clutch circuit, then replace the relief valve (see A/C COMPRESSOR THERMAL PROTECTOR REPLACEMENT  )
  • Poor or loose connections at the terminals
The A/C compressor relief valve has vented refrigerant Probable cause: A restriction in the high-pressure side of the system, the A/C condenser/radiator fans are inoperative, or the A/C compressor clutch is not disengaging
Driver's and passenger's side vent temperatures vary by more than 20°F (11°C) Probable cause: The recirculation control door or the air mix door is malfunctioning
Insufficient heating
  1. Check the coolant level (see COOLANT CHECK )
  2. Check the radiator cap (see RADIATOR CAP TEST )
  3. Check the coolant temperature during normal operation
  4. Check the heater core inlet hose temperature:
    • If it is COLD, check for restrictions in the hose, a damaged or leaking thermostat, or a damaged or leaking water pump
    • If it is HOT, check for restrictions in the heater core. Back flush or replace the heater core
  5. Check the operation of the air mix cable and linkage (see AIR MIX CONTROL CABLE REMOVAL/INSTALLATION )
  6. Check the blower motor unit for obstructions
  7. Check for air leaks around the ducts and vents
 Damaged cylinder head gasket
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