i have a 2000 2.6 hpdi. i hooked it to the water hose today to make sure everything was working before my first tournament next weekend. i noticed water coming out from behind the main relay box on the drivers side of the motor. i pulled the cover off and there is a grey box with a water line going into it that is cracked. what is this part? it looks pretty simple to change i just need to know what is is and where i can find one. thanks for all replys.