my Volkswagen Tiguan First Generation (2007-2018) makes a hissing noise when I turn on the AC

Solution

1. Preparation

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

2. Recover Refrigerant

• Tools Required: Refrigerant recovery machine
• Connect the recovery machine to the AC service ports.
• Follow the machine's instructions to safely recover the refrigerant from the system.

3. Inspect and Replace Leaking Components

• Tools Required: Socket set, wrenches, AC manifold gauge set
• Identify the source of the leak (e.g., hoses, compressor, condenser).
• Remove and replace any damaged or leaking components:
  • If replacing a hose, disconnect it from both ends and install the new hose, ensuring proper connections.
  • If replacing the AC compressor, disconnect it from the system, remove mounting bolts, and install the new compressor using the proper torque specifications.

4. Recharge the AC System

• Tools Required: AC refrigerant and manifold gauge set
• Connect the manifold gauge set to the AC service ports.
• Follow the manufacturer's specifications to recharge the system with the correct amount and type of refrigerant.
• Ensure there are no leaks before proceeding.

5. Test the System

• Reconnect the battery.
• Start the vehicle and turn on the AC to check for proper operation and cooling efficiency.
• Monitor for any hissing noise during operation.