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Steering pump noise

Engine

Model: 964, Year:1992, Mileage:81000, Type of use:Street use only
I have a '92 964. Runs fine, but in summer temperatures, I have a medium octive whistle through an RPM range of about 1300 to 1800 that sounds like it's coming from my steering pump. I've replaced the pump twice with remanufactured pumps and they both make the same noise. Could this be a problem with the cam that drives the pump or bad luck with two bad re-mfg steering pumps in a row? Thanks, Keith Martin

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