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My bet is water pump.
run the car briefly with the serpentine belt on and off and see if the sound goes away.
good to listen with the cover behind the seats off.
take the serpentine belt off -- see if the water pump pulley has some wobble in it.
look for crust around the bottom of the pump/pulley back side.
Mike
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Drivers: '15 Panamera Hybrid (wife's), ' 01 996 GT2, 00 Boxster S, '96 993 Çab/Tip (wife's)
Race Cars: '75 911 RSR Replica & '99 Spec Boxster
mike@lonestarrpm.com
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