Sounds like your heater core has gone bad.
Aha, another one! Yes, our '99 caravan is acting the same way. I have checked the bulbs and fuses, both checked good. I even checked the wires with a volt meter. No power is getting to the bulb sockets.
faulty switch
You didn't mention if you checked/tested the low beam headlamps or not.
If you have flickering lights and smell wires burning in your Dodge Caravan, you need to get that checked out by a professional. This actually happened to me once too and my van started on fire, it was horrible.
Have you checked the fuses?
Low alternator output or weak ground connection. Have the alternator checked.
in 1986 the headlights weren't fused the likely suspect would be the dimmer switch if it was located on the floor.
If the headlights are halogen, these tend to be sensitive to voltage spikes. Before replacing the headlights, have the electrical system checked for faulty voltage regulation.
have you checked your wires
Assuming that you have checked all your fuses and they are ok, then you may have a short. I found one at my front passenger side signal light, when i turned the bulb holder my bulbs would start working.
The first thing to have checked is the amount of R134A that the system has and to service it to specifications as the amount is very critical. If that is okay then then system may need to be reprogrammed.
If the window motor is not running to raise the window, then several things need to be checked to fix the problem. Check the fuse, switch, wiring, and window motor to find which part is bad and needs to be replaced.