why does my Toyota RAV4 XA50 (2019-2024) make a hissing noise when running

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Replace Vacuum Hoses

• Tools Required: Pliers, socket set, vacuum hose replacement.
• Instructions:
  1. Locate vacuum hoses connected to the intake manifold.
  2. Inspect each hose for cracks or disconnections.
  3. If damaged, remove the faulty hose using pliers.
  4. Replace with a new vacuum hose of the same diameter.
  5. Secure connections tightly and ensure no air leaks.

3. Repair Coolant Leaks

• Tools Required: Coolant, funnel, possible hose clamps, new hoses.
• Instructions:
  1. If low coolant is detected, top off with the appropriate type of coolant.
  2. If leaks are present, replace any damaged hoses or clamps.
  3. Inspect the radiator for cracks or leaks and replace if necessary.
  4. Bleed the cooling system to remove air pockets.

4. Examine and Seal Exhaust System

• Tools Required: Wrench set, exhaust sealant.
• Instructions:
  1. Inspect the exhaust system for any visible cracks or holes.
  2. Use a wrench to tighten any loose connections.
  3. Apply exhaust sealant to any small holes detected.
  4. Replace any damaged exhaust components if necessary.