why does my BMW X3 F25 (2011-2018) make a hissing sound when I turn the wheel

Solution

1. Preparation

• Gather necessary tools and parts.
• Raise the vehicle and secure it on jack stands if needed.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check Power Steering Fluid

• Remove the power steering fluid reservoir cap.
• Inspect the fluid level; top off with the manufacturer-recommended power steering fluid if low.
• Check for contamination or burnt smell in the fluid; if present, replace the fluid.

3. Inspect and Replace Power Steering Hoses

• Examine all power steering hoses for cracks or leaks.
• If leaks are found, use a socket set to disconnect the damaged hose from the power steering pump and steering rack.
• Replace with new hoses, ensuring all clamps are securely tightened.

4. Inspect and Replace Power Steering Pump (if necessary)

• If the pump is identified as the source of the hissing noise, remove the serpentine belt using a belt tensioner tool.
• Unbolt the power steering pump from its mounting.
• Disconnect the inlet and outlet hoses and remove the pump.
• Install the new pump and reconnect the hoses, ensuring a tight fit.
• Reinstall the serpentine belt.

5. Refill Power Steering Fluid

• After all components are replaced, fill the power steering reservoir with the correct fluid.
• Start the engine and turn the steering wheel from lock to lock to remove air from the system.
• Check fluid levels again and top off if necessary.