The pump will howl with any air in it's supply. The return from the rack is very turbulent and will aerate the contents of the reservoir if the fluid is too low - look in it with the engine running and it looks like it's boiling. I've seen several cars which are very sensitive to the fluid level so I wouldn't worry about the noise.
If its a slow leak then it probably only just hit the threshold where the fluid gets aerated. Hopefully the garage can find the leak, and extra hopefully it's not the main pressure hose because that is stupidly expensive!
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17th March 2016, 06:27 PM
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