The fan switch itself is easy enough to test with a multimeter, just check for continuity on the correct wires depending on switch position. I'm not sure about testing or removing the fan but you may be able to run a jumper to the resistor block or the fan itself to see if it works.
Is there another switch that is disconnected? The one that selects heat/def/ac. I think that needs to be connected and not in the off position in order to have power to the fan switch. I believe that will provide the power for the low speed and then the switch will let you select med or high fan...
On some of the earlier transmissions the converter would drain out and give the symptoms you describe. Try starting the car and shifting to neutral and let it run there for a minute or two before shifting into gear to let the converter get filled up again.
To fix the leaks inside the car get a gasket kit from DMT: Mopar C Body 69-73 AC Heater Box Rebuild Restoration Seal Gasket Kit
Is the thermal expansion valve sensing line set up properly?
There may need to be a cycling switch installed when running r134 with the RV2 compressor but I'm not...
Here is my Sportgrain convertible, when I got it and after an unfortunate incident with a 'joisy' driver. I had a parts car that I was able to get all of the unique trim from, and also scored a set of correct woodgrain decals for the side.
As purchased it had a 383 2 bbl which I've upgraded to...
I took your advice:
Install a Brake Proportioning Valve - Tech Article - Chevy High Performance Magazine
As stated in the article, rear brakes locking before the fronts creates a DANGEROUS SITUATION.
IT IS NOT NORMAL!
YOU DO NOT HAVE STEERING CONTROL WITH THE REAR BRAKES LOCKED!
Proportioning...
If you want steering control in a panic stop learn to modulate the brake pedal so the tires won't lock up. In either situation of tires locking up you WILL lose steering control, but the manner of loss will be different.
Fronts lock up, the rear tires will still provide control in that the car...
It is absolutely NOT NORMAL for the rear brakes to lock first!!! If the rears lock first, your *** end is gonna swing around and you won't have any directional control. Fronts should ALWAYS lock first!