why is my Volkswagen Golf MK7 (2015-2019) AC compressor not engaging?

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, manifold gauge set, basic hand tools, and safety glasses.
• Ensure the vehicle is parked on a flat surface and the engine is off before starting work.

2. Inspect and Replace AC Fuse

• Locate the fuse box, typically found under the dashboard or in the engine compartment.
• Remove the AC fuse using a fuse puller or pliers.
• Check the fuse for continuity. Replace if blown.

3. Test and Replace AC Relay

• Locate the AC relay in the fuse box.
• Remove the relay and test it with a multimeter for continuity.
• If defective, replace the relay with a new one.

4. Check Refrigerant Levels

• Connect the manifold gauge set to the low and high sides of the AC system.
• Read the pressure levels; if the pressure is below the specified range, the system may need refrigerant.
• If low, locate the service port and add the appropriate refrigerant type (R-134a) according to specifications.

5. Inspect and Replace Pressure Switch

• Locate the AC pressure switch, typically near the receiver-drier.
• Disconnect the electrical connector and test the switch with a multimeter.
• Replace the switch if it does not provide continuity at the correct pressure range.

6. Check and Replace the Compressor Clutch

• If the clutch does not engage, inspect the wiring and connector for damage.
• If damaged, replace the compressor clutch assembly.
• Reassemble the components and ensure proper connections.