Driving along this day in Midwest, cold. Heat is working fine and all of a sudden no more heat. Check the vent direction and that valve flow appears to work fine, airflow through respective vents. Air conditioning definitely works. Check of radiator and hose from top to manifold and it is warm to the touch. Left truck running in driveway for about 20 minutes and no appearance of overheating. What does not seem to be reacting properly is the dashboard interior temp control dial for cold or hot. Very little if any detectable heat, warmer than outside temps appears to be coming out of vents. I have not yet checked heater hoses into heater box, if there are any. Any ideas before I take into Ford dealership
Ford F-250, Lariat, 4x4, automatic, 106K miles. Will be getting 100K service in Spring.
Thanks