I have a scary klanking sound can mng from my motor. I replaced my thermostat last week and everything was fine. Now today, I here a clank, clank, clank coming from the motor. My son was helping me and, when we were putting the housing back on, he dropped the socket. We couldn't find it right away but figure it was on the skid plate somewhere. We never found the socket. Dobyou think it's in the water pump?