There are many things that can cause steering noise, and diagnosing exactly what is wrong before spending money on parts is very important.

Cold-Start Listen Test

The Cold-Start Listen Test: Listen for a whine or moan that fades as the system warms up. This could indicate a pump struggling with very cold, thick fluid. A noise that stays, as the engine warms up, could indicate a more serious mechanical problem.

Lock-to-Lock Sweep Check

A lock-to-lock sweep can reveal the source of knocks and clunks, helping to establish whether the problem lies with the rack or a track rod end.

Load Test Against a Ramp

The load test against a ramp uses the wheel of a test vehicle held against a curb or on a ramp. The steering wheel is then held at full lock while the steering is turned slowly. This test highlights cavitation of the pump or a seal leak while the system is under high pressure.

Fluid Condition Inspection

The fluid reservoir is checked for level and for signs of deterioration in colour and for signs of foaming or ‘aeration’. If there is evidence of air in the system then an audible whining or gurgling noise is likely to be present and this will not be cured by replacing parts one after the other when in fact the major problem is with the fluid in the system.

Bench or Road Noise Confirmation

If you are looking for Power Steering Specialists, see https://westernpowersteering.co.uk. As for testing the diagnosis on a car it’s simply a matter of taking the car for a test drive round the block at low speed and using full lock on the steering wheel to verify the symptoms are still present.

Using a systematic test sequence reduces the risk of further work and saves money and time.