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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is off.
• Disconnect the battery to prevent electrical issues.

2. Recover Refrigerant

• Connect a refrigerant recovery machine to the AC system.
• Open the valves to recover the refrigerant into the machine according to the manufacturer's instructions.
• Ensure all refrigerant is safely recovered to comply with environmental regulations.

3. Locate and Repair Leak

• Use a UV light to inspect the AC components for dye leaks.
• Identify the leaking component (e.g., hoses, condenser, evaporator).
• If a hose is leaking, replace the hose. For a condenser or evaporator, remove the affected component:
  • For a condenser:
    1. Remove the front grill and any obstructions.
    2. Disconnect the AC lines from the condenser.
    3. Unmount the condenser from its brackets and remove it.
    4. Install the new condenser by reversing the removal steps.
  • For an evaporator:
    1. Remove the dashboard and HVAC assembly as necessary.
    2. Disconnect the evaporator from the system.
    3. Install the new evaporator and reassemble the dashboard.

4. Recharge AC System

• Ensure that the system is vacuumed for at least 30 minutes to remove moisture.
• Connect the refrigerant charging machine and fill the system with the correct amount of refrigerant (R-1234yf or R-134a, as applicable).
• Monitor the pressures during charging to ensure proper fill.

5. Final Checks

• Reconnect the battery.
• Start the engine and run the AC system to ensure proper operation.
• Check for leaks again using the UV light.