HVAC System - Service, Testing And Troubleshooting

• Diagnosis
  • A/C Diagnostic Process
• Component Location Index
  • Climate Control System Component Location Index
  • Heating and A/C Systems Component Location Index
  • Rear A/C System Component Location Index
  • Rear Window Defogger Component Location Index
• Input Test
  • Heated Steering Wheel Control Unit Input Test (2016 2017 2018)
• Check
  • A/C Compressor Clutch Check
    • Check
  • A/C Refrigerant Leak Check (1234yf)
    • Check
  • A/C Refrigerant Leak Check (134a)
    • Notes
    • Check
  • A/C System Noise Check
    • Check
• Replacement
  • A/C Refrigerant Oil Replacement (1234yf)
    • Notes
    • Replacement
  • A/C Refrigerant Oil Replacement (134a)
    • Notes
    • Replacement
  • A/C Refrigerant Recovery/Evacuation/Charging (1234yf)
    • Notes
    • Procedure
  • A/C Refrigerant Recovery/Evacuation/Charging (R134a)
    • Notes
    • Procedure
• A/C System Description
  • A/C Pressure Sensor (Fixed Capacity Compressor)
  • A/C Pressure Sensor (Variable Capacity Compressor)
  • Compressor
  • Condenser
  • Evaporator Temperature Sensor
  • Overview
• Climate Control System Description
  • Cold Storage Evaporator
  • Customize Function
  • Humidity/In-Car Temperature Sensor
  • Outside Air Temperature Sensor
  • Overview
  • Sunlight Sensor
• Heated Steering Wheel System Description
  • Components
  • Control/Function
  • System Diagram
• Rear HVAC Description
  • Rear A/C System Overview
  • Rear Window Defogger System Control/Function
  • Rear Window Defogger System Overview
  • Rear Window Defogger System Diagram
• General Information
  • A/C Service Tips and Precautions (1234yf)
  • A/C Service Tips and Precautions (134a)
• Repair Regeneration
  • Rear Window Defogger Wire Repair
    • Reconditioning
• Circuit Diagram
  • Climate Control System Circuit Diagram (2016 2017 2018)
  • Climate Control System Circuit Diagram (2019 2020 2021)
  • Heated Steering Wheel Circuit Diagram (2016 2017 2018)
  • Heated Steering Wheel Circuit Diagram (2019 2020 2021)
  • Heating and A/C Systems Circuit Diagram (2016 2017 2018)
  • Heating and A/C Systems Circuit Diagram (2019 2020 2021)
  • Rear Window Defogger Circuit Diagram (Without Auto Idle Stop System)
  • Rear Window Defogger Circuit Diagram (2016 2017 2018: With Auto Idle Stop System)
  • Rear Window Defogger Circuit Diagram (2019 2020 2021: With Auto Idle Stop System)
• 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
    • Button/Indicator
    • How to Use the Self-Diagnostic Function Without the HDS
    • How to Check for History DTCs
    • How to Clear History DTCs
    • Checking for DTCs
    • Displaying Sensor Inputs at the Climate Control Unit
    • Checks Before Using the Sensor Input Display Mode
    • Run the Sensor Input Display Mode
  • How to Troubleshoot the Heating and A/C Systems
    • Button/Indicator
    • How to Use the Self-Diagnostic Function
    • How to Check for History DTCs
    • How to Clear History DTCs
    • Checking for DTCs
    • Max Cool Position Function
• DTC Troubleshooting
  • A/C Compressor Clutch Circuit Troubleshooting (Without Climate Control)
  • A/C Compressor Clutch Circuit Troubleshooting (2016 2017 2018: With Climate Control)
  • A/C Compressor Clutch Circuit Troubleshooting (2019 2020 2021: With Climate Control)
  • A/C Condenser Fan High Speed Circuit Troubleshooting
  • A/C Signal Circuit Troubleshooting (2019 2020 2021)
  • Climate Control Unit Power and Ground Circuit Troubleshooting
  • HVAC Control Power and Ground Circuit Troubleshooting
• 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 HVAC Control Unit Or The Vehicle
  • HDS Does Not Communicate With The Climate Control Unit Or The Vehicle
  • Insufficient Heating (Heating/Air Conditioning)
  • Insufficient Heating (Climate Control)
  • The A/C Compressor Clutch and The A/C Condenser/Radiator Fans Are Inoperative, But The Blower and Heater Controls Work (Heating/Air Conditioning)
  • The A/C Compressor Clutch and The A/C Condenser/Radiator Fans Are Inoperative, But The Blower and Heater Controls Work (Climate Control)
  • The A/C Compressor Clutch Cycles Rapidly On and Off (Climate Control)
  • The A/C Compressor Clutch Cycles Rapidly On and Off (Heating/Air Conditioning)
  • The A/C Compressor Clutch Does Not Disengage When The A/C Switch Is Off (Heating/Air Conditioning)
  • The A/C Compressor Clutch Does Not Disengage When The A/C Switch Is Off (Climate Control)
  • The A/C Compressor Clutch Does Not Engage, But The A/C Condenser and Radiator Fans Operate, and The Blower and Heater Controls Work (Climate Control)
  • The A/C Compressor Clutch Does Not Engage, But The A/C Condenser and Radiator Fans Operate, and The Blower and Heater Controls Work (Heating/Air Conditioning)
  • The A/C Compressor Relief Valve Has Vented Refrigerant (Climate Control)
  • The A/C Compressor Relief Valve Has Vented Refrigerant (Heating/Air Conditioning)
  • The A/C Condenser/Radiator Fans Do Not Run At High Speed, But Do Run At Low Speed With The A/C On (Heating/Air Conditioning)
  • The A/C Condenser/Radiator Fans Do Not Run At High Speed, But Do Run At Low Speed With The A/C On (Climate Control)
  • 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 (Climate Control)
  • 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 (Heating/Air Conditioning)
  • The Blower and Heater Controls and The A/C System Do Not Work (Heating/Air Conditioning)
  • The Blower and Heater Controls and The A/C System Do Not Work (Climate Control)
  • The Blower Fan Runs Slower Than Expected In Cold Weather (When In AUTO mode) (Heating/Air Conditioning)
  • The Blower Fan Runs Slower Than Expected In Cold Weather (When In AUTO mode) (Climate Control)
• Connector View
  • Climate Control Unit Connector For Inputs and Outputs (2016 2017 2018)
  • Climate Control Unit Connector For Inputs and Outputs (2019 2020 2021)
  • Hvac Control Unit Connector For Inputs and Outputs
  • Heated Steering Wheel Control Unit Connector For Inputs and Outputs (2019 2020 2021)
• Test
  • A/C Compressor Variable Capacity Control Solenoid Test
    • Test
  • A/C System Test (134a)
    • Notes
    • Test
  • A/C System Test (1234yf)
    • Notes
    • Test
  • Air Mix Control Motor/Mode Control Motor/Recirculation Control Motor Test
    • Notes
    • Test
  • Blower Power Transistor Test
    • Test
  • Heated Steering Wheel Switch Test (2016 2017 2018)
    • Test
  • Heated Steering Wheel Switch Test (2019 2020 2021)
    • Test
  • Heated Steering Wheel Temperature Sensor Test (2016 2017 2018)
    • Test
  • Heated Steering Wheel Temperature Sensor Test (2019 2020 2021)
    • Test
  • Radiator and A/C Condenser Fan Motor Test
    • Test
  • Rear Blower Power Transistor Test
    • Test
  • Rear HVAC Control Motor Test
    • Notes
    • Test
  • Steering Heater Test (2019 2020 2021)
    • Test
  • Sunlight Sensor Test
    • Test
• Inspection
  • A/C System Contamination Inspection
    • Inspection
    • Replacement
  • A/C System Inspection
    • Inspection
  • Drive Belt Auto-Tensioner Inspection
    • Inspection
• Symptom Troubleshooting Index
  • Climate Control System Symptom Troubleshooting Index
  • Heating and A/C Systems Symptom Troubleshooting Index
• DTC Troubleshooting Index
  • Heating and A/C Systems DTC Troubleshooting Index