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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 735 (HEATING, VENTILATION AND AIR CONDITIONING)CLIMATE CONTROLSYMPTOM TROUBLESHOOTING INDEX
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Symptom Troubleshooting Index

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Symptom Troubleshooting Index
WARNING: This page is about a different car, the 2011 Honda Insight and 2010 Honda Insight. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLESHOOTING CHART

Symptom Diagnostic procedure Also check for
The Recirculation control doors do not change between Fresh and Recirculate Probable cause: Recirculation control motor circuit malfunction
Do the recirculation control motor circuit troubleshooting (see RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING )
  • Blown fuse No. 10 (7.5 A) in the under-dash fuse/relay box
  • Cleanliness and tightness of all terminals
The blower and heater controls and the A/C system do not work Probable cause: Climate control unit malfunction
Do the climate control power and ground circuit troubleshooting (see CLIMATE CONTROL POWER AND GROUND CIRCUIT TROUBLESHOOTING )
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
Troubleshoot the pressure sensor circuit:
NOTE: The A/C pressure sensor can malfunction without setting a DTC
  • HVAC DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
  • Blown fuse No. 30 (30 A), No. 43 (7.5 A) and No. 47 (30 A) in the under-dash fuse/relay box
  • Poor or loose connections at the terminals
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:
The A/C condenser fan and/or the radiator fan do not run with the A/C on Probable cause: Condenser/radiator fan low speed circuit malfunction
Do the radiator and A/C condenser fan low speed circuit troubleshooting (see RADIATOR AND A/C CONDENSER FAN LOW SPEED CIRCUIT TROUBLESHOOTING )
The condenser/radiator fans do not run at high speed, but do run at low speed Probable cause: Malfunction in the fan(s) high speed circuit
Do the following troubleshooting as needed:
Voice commands do not work Probable cause: Communication problem between the climate control unit and the navigation system
Do the navigation communication line circuit troubleshooting (see NAVIGATION COMMUNICATION LINE CIRCUIT TROUBLESHOOTING )
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
Troubleshoot the ECT sensor circuit:
The A/C compressor clutch cycles rapidly on and off Probable cause: A/C system is very low on refrigerant, indicating a possible leak
The A/C compressor clutch does not disengage when the A/C switch is off Probable causes: 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. 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 (see A/C COMPRESSOR RELIEF VALVE REPLACEMENT ).
The A/C compressor relief valve has vented refrigerant
NOTE: This indicates the A/C system pressure was very high
 Probable causes: A high-side restriction, the A/C condenser/radiator fans are inoperative, or the A/C compressor clutch is not disengaging Powertrain DTCs (see GENERAL TROUBLESHOOTING INFORMATION )
HDS does not communicate with the climate control unit or the vehicle Troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING )  
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. Do the air mix control motor test (see AIR MIX CONTROL MOTOR TEST )
  6. Check the blower motor unit for obstructions
  7. Check for air leaks around the ducts and vents
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