why is my Volkswagen Golf MK7 (2015-2019) making a hissing noise

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts during the repair.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or wear.
  2. Use a vacuum pump to test the integrity of each hose if necessary.
  3. Remove the damaged vacuum hoses using pliers and replace them with new hoses of the same diameter.
  4. Secure new hoses with hose clamps as necessary.

3. Repair or Replace Intake Components

• Sub-steps:
  1. Remove the air intake duct from the throttle body and check for any cracks or deterioration.
  2. Inspect the throttle body gasket; replace if damaged.
  3. Clean the throttle body using throttle body cleaner and a soft cloth.
  4. Reinstall the air intake duct and ensure all connections are tight.

4. Inspect Coolant System

• Sub-steps:
  1. Check all coolant hoses for signs of leaks, bulges, or wear.
  2. Tighten any loose connections; replace any damaged hoses.
  3. Inspect the water pump and radiator for leaks, and replace if necessary.
  4. Refill the coolant system with the recommended coolant type.