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

Solution

1. Preparation

• Gather tools and parts required.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  • Locate and visually inspect all vacuum hoses connected to the intake manifold.
  • Check for cracks, wear, or disconnections.
  • Replace any damaged hoses with new, OEM-spec hoses.
• Tools Required: Basic hand tools, hose clamp pliers.

3. Inspect and Repair Air Conditioning System

• Sub-steps:
  • Check the AC compressor for signs of leaks.
  • Inspect the AC lines for hissing noises when the AC is running.
  • If leaks are found, recharge the system and replace faulty components (e.g., compressor, O-rings).
• Tools Required: Refrigerant gauge set, manifold gauge set.

4. Check Exhaust System

• Sub-steps:
  • Inspect the exhaust manifold, pipes, and muffler for leaks or holes.
  • Use a smoke machine to detect leaks if necessary.
  • Replace any damaged exhaust components.
• Tools Required: Exhaust leak tester, socket set.

5. Inspect Serpentine Belt and Pulleys

• Sub-steps:
  • Visually inspect the serpentine belt for cracks or signs of wear.
  • Check the tensioner and idler pulleys for smooth operation.
  • Replace the serpentine belt and/or pulleys as needed.
• Tools Required: Socket set, belt tensioner tool.