Did you use high pressure or low pressure when power washing? If you used High pressure setting on your power washer you may have damaged something in there. Only use low pressure and even then don't put the water on anything with wires or seals. As for the singing problem your belt may have loosened up and isn't tight on the pulley.
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06 GT Mustang C.A.I, SCT TUNER, HURST SHORT SHIFTER, PUSH BUTTON START, PYPES CAT BACK, 3:73 gears, STOPTECH STAGE II brake kit,FR TOWER BRACE.
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