Join Date: Dec 2000
Location: Monroe, WA, USA
it can be the front bearing or the punmp it self, the by pass valve could be stuck and this causes a whine in the pump.
R&R the pump only way to fix it. sorry no fix in a bottle here. but make sure it is not the belt!
check the pully for a grove or a small nick. and the belt for glazing. also spray a little soapy water on the belt while runing. if it stop's makeing noise or get's quieter it is the pully/belt.