I haven't updated in a while, but I've still been tinkering away making some progress.
The car is unfortunately positioned under a tree that also seems to be a popular toilet for the local avian fauna. I picked up a gazebo in an attempt to help shield the car. Since I need to do some more work on things, the car went back up on axle stands.
The first task on my list was to finish the cooling system. The radiator needs a fan. Ideally, an electric fan using the factory wiring. However, my non-air conditioned e30 didn't leave the factory with an electric fan at all. The fusebox just has a couple of empty spots where the fan relays and fuses should be. This means I have add the wiring myself.
I got the biggest fan I could fit.
Created a custom wiring loom using an E36 2 stage thermoswitch, and a big ass resistor for the low speed.
The loom was run around the left side of the engine bay and into the fusebox. With a bit of fiddling, I was able to connect wiring to factory locations, and add the required fuses and relays.
Radiator back in the car with new fan
I refilled the cooling system, and tested everything. Both low speed and high speed are working nicely.