Yep, replaced the water pump again yesterday and the thermostat once more. I know one thing now though. She, my Jeep, is a total liar. I used an IR heat gun aimed at at all of the hot points i.e. base of the thermostat neck, coolant, upper and lower radiator hose, and even at the base of the intake nearest the head. It NEVER reads more than 194 while the gauge tells me 240. If it were 240, this thing would be blowing steam like mad! So now, which sensor runs that gauge? The white one wire "sensor" or the balck two wire sending unit? I think I am going to hook up my Snapon scanner to it and see what the computer thinks the temp is. As for the no heat ... Still barely any heat. When I took measurements of the heater hoses, the input is about 50 degrees hotter than the output from the heater core = clogged heater core.