why does my Volkswagen Golf MK7.5 (2020-Present) make a hissing noise

Solution

1. Preparation

• Gather tools and safety equipment.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical issues.

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, socket set
• Steps:
  1. Locate the vacuum hoses connected to the intake manifold.
  2. Inspect each hose for cracks or disconnections.
  3. Replace any damaged hoses with OEM parts, ensuring a secure fit.

3. Check and Seal Intake Manifold

• Tools Required: Torque wrench, gasket scraper
• Steps:
  1. Remove any components obstructing access to the intake manifold.
  2. Inspect the intake manifold gasket for signs of wear or damage.
  3. Clean the mating surfaces with a gasket scraper.
  4. Replace the gasket if necessary, and torque the manifold bolts to manufacturer specifications.

4. Inspect Air Conditioning System

• Tools Required: Refrigerant gauge, UV leak detection kit
• Steps:
  1. Check the refrigerant levels using a refrigerant gauge.
  2. Use a UV leak detection kit to inspect for leaks in the AC hoses and connections.
  3. If leaks are found, replace the affected components and recharge the AC system.

5. Inspect Power Steering System

• Tools Required: Fluid tester, socket set
• Steps:
  1. Check the power steering fluid level; top off if low.
  2. Inspect the power steering pump for damage or noise while the engine is running.
  3. If the pump is faulty, replace it according to manufacturer guidelines.