how do I fix a refrigerant leak in my Volkswagen Golf MK7 (2015-2019) AC system?

Solution

1. Preparation

• Tools Required: A/C manifold gauge set, UV dye, electronic leak detector, vacuum pump, refrigerant recovery machine, safety goggles, gloves.
• Wear safety goggles and gloves during the entire process.
• Ensure the vehicle is parked on a flat surface and the engine is off.

2. Recover Refrigerant

• Connect the refrigerant recovery machine to the low and high-pressure service ports.
• Follow the manufacturer's instructions to safely recover the refrigerant from the system.

3. Locate the Leak

• If you added UV dye, use a UV light to inspect the AC components for dye leaks after running the system.
• If detected, mark the location of the leak with a marker.

4. Repair the Leak

• For hose and seal leaks:

  • Disconnect and remove any damaged hoses or seals.
  • Replace with new OEM parts, ensuring proper fit.
  • Use a torque wrench to tighten any connections to manufacturer specifications.

• For component leaks (e.g., compressor, condenser):

  • Remove the affected component according to the service manual.
  • Replace with a new or refurbished unit.
  • Ensure all gaskets and seals are replaced to prevent future leaks.

5. Refill Refrigerant

• Connect the AC manifold gauge set to the service ports.
• Evacuate the system using a vacuum pump for at least 30 minutes to remove moisture.
• Refill the system with the correct amount of refrigerant (R-134a) as specified in the vehicle's service manual.

6. Test the System

• Start the engine and turn the AC on to the maximum setting.
• Monitor the system pressures with the manifold gauge set to ensure they are within normal operating ranges.