I'm having difficulties finding a leak. I'm getting a puddle of coolant on the floor just inside the passenger side front tire. The only wetness I see is under the metal tube going to the heater core that runs across the bottom front of the engine (just under the crank pulley). I suppose it could be a pinhole leak in the tube, but I'm losing quite a bit of coolant. What would I see if the water pump was leaking? I don't see any staining that would indicate coolant dripping from the pump, but since it's buried, I'd assume I wouldn't see much anyway. Any hints?