I have the following truck above. I have no heat blowing and I did the following already.
Replaced the thermostat
Replaced the coolant temp plug
There is no buildup on the window from the heater coil or any water on the bottom anywhere.
The hoses are hot
Someon told me maybe my whole heater control unit needs replacing becuase when you select the control to either go to vent or bottom it only blows on the defrost part. The 2 butttons for a/c or recircluation do not light up when you press them. However the low, med, high knob works fine but again only blow cold air onto the winshied. Before I goto to the junkyard and waste money does anyone have any ideas.