Courtesy lights don't work

check the courtesy/dome light fuse and see that the manual dimmer/dome switch isn't turned down.

That;s fuse #4 check brake switch to ignition do you have curse control that will also come into play .
What you really need are the factory manuals and a meter or test light to track this down .
A company called HELM .COM prints most factory manuals for most vehicles .50 to 100 dollars you need them to fix especially a 96 Chevy that's the first year OBD 2 they tend to have design problems and are hard to work on .

check fuses

If it is low on freon it won't come on. If the blower is not working it could be the fan or switch.

Sounds like a problem with the sensor in the driver's door latch.

courtesy light fuse, but if it is a fuse then what made it pop. I would also check the dimmer switch and the multifunction switch.

I would acquire an ohm meter, and check the circuit for a short to ground and trace it to the point of origin. If there are aftermarket accessories/utilities installed, then I would start there.

I haven't picked up the part yet but it should be in tomorrow. According to a tech update from Chrysler in 1997, the rear hatch door has a door ajar switch in the handle and for, at least, the 95's and 96' switch;s were getting wet and corroding at the contacts. Unless this switch sends a signal to the computer, telling it that the door is closed, the courtesy lights stay on and drain the battery.
I hope that this part will fix the problem and I will let you know how it came out. I'll have to replace the battery also.

Is it an old van? Can you see on the door frame a switch does it come out when the door is opened (push in and out a few times). 3 position switch on always / off always and door switch?

the head light switch