Unless your van has some unusual heating system, the heat going out could mean that you are totally out of coolant, or your thermostat may be stuck closed. If you have a normal heating system and your heater is still blowing air, just not hot air, it could be those two things. Is the van having any other problems?
I do not believe that it would clear the caliper.
Dead short to ground or an overload
A short in the wiring (grounding out)
your cabin filter might be dirty
not usually!!if fuse is blowing out check for short!!
I had a 96 Stratus that would do that, and it turned out to be that the starter was bad.
If it blows when cranking the starter has failed.
could be a faulty thermostat don't over heat it to often you'll end up blowing your heads gaskets drive safe
i know the AC in my ZX2 stopped blowing because of a loose wire
There are a few things to check, first are the bulbs good? high and low are separate elements and the low could be blown out. Second is check the fuses, high beam and low beams often have separate fuses. Third would be the dimmer switch.
Cause humidity
A more detailed explanation of the symptoms would have to be given in order for a determination to be made. As is, the question leaves us no indication of whether it's not blowing air period, or it it's blowing hot air, or what it's doing exactly.