what causes the AC compressor clutch not to engage in Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical systems.

2. Check Refrigerant Levels

• Connect a refrigerant pressure gauge to the AC service ports.
• Assess the pressure readings to determine if the refrigerant is low.
• If low, proceed to recharge the AC system with the appropriate refrigerant type (R-134a).

3. Inspect Electrical Connections

• Visually inspect the wiring harness connected to the AC compressor for signs of damage.
• Use a multimeter to check for continuity in the wiring and verify that there are no shorts or breaks.
• Repair or replace any damaged connectors or wires as necessary.

4. Test the AC Relay

• Locate the AC relay in the fuse box (refer to the owner’s manual for exact location).
• Remove the relay and test it with a multimeter to ensure it operates correctly.
• Replace the relay if it is found to be faulty.

5. Check Voltage at Compressor Clutch

• With the vehicle turned on and AC activated, measure the voltage at the compressor clutch connector.
• If voltage is present but the clutch does not engage, the clutch may need to be replaced.
• If no voltage is detected, trace the wiring back to the relay and climate control module for issues.

6. Replace the AC Compressor Clutch (if necessary)

• Remove the AC compressor from the vehicle following the manufacturer’s guidelines.
• Replace the AC compressor clutch assembly.
• Reinstall the compressor, ensuring all bolts are torqued to specifications.