Compressor Clutch Does Not Disengage

HVAC Compressor Clutch Does Not Disengage

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview)
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview)
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)

Circuit/System Description

The heating ventilation and air conditioning (HVAC) control module supplies a 12-volt reference voltage and a control circuit to the air conditioning compressor. The HVAC control module continuously monitors the control circuit for an open circuit or short to voltage or ground.

Reference Information
Schematic Reference

HVAC Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Air Temperature Description and Operation (Air Temperature Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the A/C compressor.
2. Ignition ON, test for 12 volts between the 12-volt reference circuit harness connector terminal 2 and ground.

• If less than the specified range, test the 12-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.

3. Ignition OFF, test for less than 5 ohms between the low reference circuit harness connector terminal 1 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the HVAC control module.

4. If all circuits test normal, replace the HVAC control module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests)

* Air Conditioning Compressor Replacement (2.4L (LAX)) (Service and Repair)Air Conditioning Compressor Replacement (1.8L (LAY)) (Service and Repair)
* Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement (Service and Repair)
* Heater and Air Conditioning Control Replacement (Service and Repair)
* Control Module References (Programming and Relearning)