... last summer got new ps pump from amazon ... China made copycat of original volvo ps pump. old ps pump was a lot heavier by weight in comparison with replacement. Worked fine - BUT from the very first moment was so noizzzzy...cold or hot... using Dex3-Mercon fluid.No air bubbles, clear - no deposits at all ( magnet inside reservoir clean )Guess that is how it work... Funny part - the OLD NOISE from moment when car start and still cold - did not gone after ps pump replaced ( as i sure diagnosed it come from old ps pump... ) So, for now - alternator or AC compressor suspects. Timing belt parts changed before - and noise not gone. Will see...
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