why does my Volkswagen Golf MK7 (2015-2019) make a hissing noise when driving?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Ensure the vehicle is parked on a level surface and engage the parking brake.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks, splits, or disconnections.
  2. If damaged hoses are found, remove the old hoses using a hose clamp tool.
  3. Replace with new vacuum hoses of the same diameter and length, securing with appropriate hose clamps.
• Tools Required: Hose clamp tool, screwdriver, replacement vacuum hoses.

3. Inspect and Replace Intake Manifold Gaskets

• Sub-steps:
  1. Remove the intake manifold by disconnecting associated electrical connectors and removing mounting bolts (consult service manual for torque specifications).
  2. Carefully lift the manifold off and replace the old gaskets with new ones.
  3. Reinstall the intake manifold, ensuring all bolts are torqued to manufacturer specifications.
• Tools Required: Socket set, torque wrench, gasket scraper, replacement intake manifold gaskets.

4. Check and Repair Turbocharger

• Sub-steps:
  1. Inspect turbocharger hoses for any signs of damage or looseness.
  2. If leaks are detected, replace damaged hoses or clamps as necessary.
  3. Ensure the turbocharger is functioning properly by testing boost pressure if applicable.
• Tools Required: Torque wrench, boost pressure gauge, replacement turbo hoses and clamps.