98 Caravan Blower Motor Problems

We have a 1998 Dodge Caravan Sport and started having blower motor problems last fall. After replacing the blower motor, we drove it home on our 3 miles of gravel roads. Before long, dust was pouring in from all of the vents. This had never happened before. As soon as the damp weather moved in, our windows started fogging up on us. The tempurature in the van would become warmer and very humid. We had to keep a rag in the van to keep the windows clear enough to see. Sometimes the tempurature would suddenly cool down and the windows would start clearing up. We also had an episode late winter when the snow was thawing. Water was dripping through the vents, seams, etc., of the roof liner. Possibly the build up of condensation between the liner and the roof? Now that the roads are dry again, instead of condensation on the windows, we have a van full of dust again. Our dealer doesn't seem to know what the problem could be and doesn't believe their replacing the blower motor had anything to do with all of this. Do you have any suggestions? Might it be the climate control panel? The dust coming into the vehicle reminds us of when we would leave the recirculation switch on. Could it be that the shutter door is not working properly because of computer problems? Any help would be greatly appreciated.

You might want to start by doing a relaibration of the a/c control head. If you do a search on this forum it will explain how to do it.

New climate control panel...a/c and heat control module took care of problem.