Where there usually a leak, is the top hose clamp on the thermostat housing. That one lets the antifreeze drip right in the place where the water pump would leak. You can get to it with a long screwdriver, unless the clamp is in the wrong position. as for shavings in the coolant, there really would not be anyplace else for the shavings to come from, but the water pump, I don't think. DON"T use stop leak, except for a last resort
