moribundman

temp of coolant in the radiator or temp of coolant in the head? Does the gauge use the same sensor for both, ECU and the gauge? I know only of the sensor at the back of the head in the coolant line.

sbmellen

...when I park my car after driving here in Phoenix during the summer and then go and start it up anywhere from 5 to 10 minutes later, the coolant temperature needle is anywhere from 60% to 75%, whereas when running it is straight up at 50%. I'm thinking from the heat transfer from the heads, the coolant gets much hotter nearer them when the car is shut off and the coolant isn't being circulated.

moribundman

It makes sense to measure the coolant coming out of the head rather than measuring the radiator coolant temp. That way, if overheating is about to happen, you'll notice it before the radiator overheats.

sbmellen

...for the temperature differential - one temp sensor as the coolant exits the head and another one as it exits the radiator.

moribundman

But I think it would confuse most people. :-P

Kris Hansen

It's more by the heads, not in the rad. Same for the gauge and the ECU..

moribundman

Thanks Kris!