I have a 96 explorer eddie bauer v6 4L and for the last 3 Winters the heat has been going in and out. It works just fine as Winter approaches and then again as we get into early Spring, but right when its necessary, it starts blowing cold. No problems with A/C, just heat. I would really appreciate any help anybody can give me.

Check the first link in my signature. Watch the thermostat and radiator flush videos.