you are right Brad the location is the diference--- the water temp is slightly different in differnt locations throughout the motor. The type temp sender used here will not sense metal temps-- it has to have coolant circulating around it before it will work. Volkswagen and Audi motors used a temp sensor the sensed metal tempratures. Next time you boil a pan off water take notice just before it boils it forms bubbles in the bottom of the pan-- the water closest to the burner is hotter than the water in the top of the pan. Likewise the water closest to the combustion chamber is hotter than other parts of the motor.The water in the head area is going to get hotter quicker and should drop when the thermostat opens and the coolant begins to circulate through the radiator.Just my thinking--Paul
