318 overheating

1970PAValiant said
So I am driving it and after about an hour it starts to go into the hot zone. Pull over. Open the radiator cap

Was the system pressurized when you took the cap off, it should have sprayed coolant all over the place if it was pressurized.

What pressure cap do you have?

The temps you saw don't seem too far off to me.

You mentioned you replaced the rad. What part number is it?

Regarding the temp guages... You could have an IVR issue. What does your fuel gauge show?

I can't imagine the engine being very warm after 3 hours.