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Symptom Troubleshooting Index

SYMPTOM TROUBLESHOOTING CHART

Symptom Diagnostic procedure Also check for
Recirculation control doors do not change between Fresh and Recirculate Recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING  )
The blower motor does not run immediately even though the engine is fully warmed up
NOTE: The temperature control dial or button must be set between 64 °F (18 °C) and 90 °F (32 °C) and the engine coolant temperature is above 104 °F (40 °C) ECT Sensor 1 circuit troubleshooting (see ECT SENSOR 1 CIRCUIT TROUBLESHOOTING  )
 Cleanliness and tightness of all connectors
Blower, heater controls, and A/C do not work Climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING  )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G401
  • Cleanliness and tightness of all connectors
Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on) Radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 58 (30 A) in the under-hood fuse/relay box, and No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G201
  • Cleanliness and tightness of all connectors
The A/C condenser fan does not run at high speed (but both fans run at low speed and the A/C compressor operates with the A/C on) A/C condenser fan high speed circuit troubleshooting (see A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Poor ground at G201
  • Cleanliness and tightness of all connectors
Both fans do not run at high speed with the A/C on (but both fans run at low speed and the A/C compressor operates with the A/C on) Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )
Both fans run at high speed all the time with the A/C on Radiator and A/C condenser fan high speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN HIGH SPEED CIRCUIT TROUBLESHOOTING )
The A/C compressor clutch does not engage (but both fans run at high speed with the A/C on) A/C compressor clutch circuit troubleshooting (see A/C COMPRESSOR CLUTCH CIRCUIT TROUBLESHOOTING )
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION  )
  • Blown fuse No. 59 (7.5 A) in the under-hood fuse/relay box, and No. 3 (7.5 A) in the driver's under-dash fuse/relay box
  • Cleanliness and tightness of all connectors
A/C system does not come on (both fans and the A/C compressor do not work); heater is OK A/C pressure switch circuit troubleshooting (see A/C PRESSURE SWITCH CIRCUIT TROUBLESHOOTING )
Rear mode control doors do not change between ceiling vents (cool) and floor vents (hot) Rear mode control motor circuit troubleshooting (see REAR MODE CONTROL MOTOR CIRCUIT TROUBLESHOOTING  )
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