HVAC System - Testing & Troubleshooting

• Component Location Index
  • Climate Control System Component Location Index
  • Rear Window Defogger Component Location Index
• General Information
  • A/C Service Tips and Precautions
    • Notes
    • A/C Label Description
• Connector View
  • Climate Control Unit Connector for Inputs and Outputs
• Check
  • A/C System Noise Check
    • Check
• Repair Regeneration
  • Rear Window Defogger Wire Repair
    • Reconditioning
• Climate Control System Symptom Troubleshooting
  • The blower and the heater controls and the A/C system do not work
• Circuit Diagram
  • Climate Control System Circuit Diagram
  • Rear Window Defogger Circuit Diagram
• Diagnosis
  • A/C Diagnostic Process
• How to Information
  • How to Troubleshoot the Climate Control System
    • How to Check for DTCs with the HDS
    • How to Use the Self-Diagnostic Function with the HDS
    • How to Use the Self-Diagnostic Function without the HDS
    • Checking for DTCs
    • How to Check for History DTCs
    • How to Clear the History DTCs
    • Displaying Sensor Inputs at the Climate Control Unit
    • Checks Before Using the Sensor Input Display Mode
    • Run the Sensor Input Display Mode
• Test
  • A/C System Test
    • Notes
    • Test
  • Radiator and A/C Condenser Fan Motor Test
    • Test
• Adjustment
  • A/C Refrigerant Oil Adjustment
    • Adjustment
• Inspection
  • A/C System Contamination Inspection
    • Inspection
    • Replacement
  • A/C System Inspection
    • Inspection
• Symptom Troubleshooting Index
  • Climate Control System Symptom Troubleshooting Index
• Symptom Troubleshooting Index for Viewer
  • Driver's and passenger's side vent temperatures vary by more than 20 °F (11 °C)
  • HDS does not communicate with the climate control unit or the vehicle
  • Insufficient heating
  • The blower and the heater controls and the A/C system do not work
  • The 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
  • The electric A/C compressor and the cooling fan are inoperative, but the blower and heater controls work
  • When an engine stops, the heater does not warm (The PTC heater does not heat up)
• Description & Operation
  • A/C System Description
  • A/C System Description - Components
  • A/C System Description - System Diagram
  • Rear Window Defogger System Description
  • Rear Window Defogger System Description - System Diagram
• Replacement
  • A/C Refrigerant Oil Replacement
    • Notes
    • Replacement
  • A/C Refrigerant Recovery/Evacuation/Charging
    • Notes
    • Procedure
• Troubleshooting
  • PTC Heater Circuit Troubleshooting