Glad I found this forum it has already helped me I have a '04 dakota, the Heat works well just defroster never defrosts the whole front or side window, Just bought truck used 160,00 miles just wish the defroster defrosted all the front window. Is it the heater core? I flushed it and it was not clogged, clear water came out no rust or anything. Is the blower motor weak maybe? No oily feel to the dampness it is just on the sides, defroster works in the center and through most of the driver side and passenger front except about 3-4 inches from the side? 4 wheel drive truck great for the bean fields etc. Should I replace the heater core? Air never gets to side windows. What would you do?