@jablackburn

That would make sense. Thanks. I'll look at it in the am.

@chax I thought about too low too. Reservoir is full and radiator has no filler cap. Somehow I think it has something to do with the DEL as now the radiator fan runs even when the engine is not hot. @WeAre06 I thought about the thremo being stuck open but the egine was getting heat when air temp was...

Seems that the heater will just not get warm. Evan after 10+ miles of driving temp barely moves. Almost no heat generated and now CEL has come on and radiator fan runs after shut off. Air temp is in 20's and coolant is full.