Originally Posted by
Big Greenie
If it gets cold enough that the truck can not maintain normal operating temp on the gauge while driving, then you need to consider a cold front and blocking some airflow.
Well, you did mention blocking in the grille first. If the truck can not maintain normal operating temp on the gauge while driving, I'd go with replacing the thermostat.
Are you keeping up with this, NorthernFordOwner? Fan clutches, blend doors, cold fronts.... Welcome to FTE!