I have a 2003 dodge caravan se. I got up one morning to take the kids to school and noticed that the heat was not working. I thought at first that it was a radiator problem, but I soon realize that I had heat as long as I turned the fan **** on the dash all the way to the highest level. When I did that, then the fans in the dash started blowing on high and I had heat. But none of the lower fan settings worked. On high the fans are very loud and the heat intense. I have to keep turning it on and off. It was working fine the night before. What do you think it might be?

 

It is probably just a blower resistor
cheap part and easy to fix(at least on my jeep)

did the same as you say, works only on high, cool air only works on high too?

others will post where it is on your van, probably behind the glove box