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Got it all solved. Dead solenoid was the cause. Got Colt's new one put in, works like a charm. Thanks everyone for the advice!

I've got a pretty good multimeter, there is definitely adequate power to the solenoid.

I gotta make sure the electric stuff is functioning properly first, otherwise the solenoid won't matter.

I ordered one from him, good thing anyways because this old one won't work despite being cleaned up, and I broke off one of the brass fittings reinstalling it. I get 27v from the plug on startup and with the fording switch on. Is there a way to get it to "engage" thinking that the thermal...

I opened up the solenoid, looks like there was a bit of schmutz on the contact part of the valve. Maybe this is what was making it stick? The rest appears OK at least to me. I might have a 24v power supply around here somewhere I can test it with.

I guess at this point the next thing I can test is "what is happening on the solenoid wires?" so what should I look for here? Assuming 24v power? What is the default vs activated state (ie: does power to the solenoid open or shut the valve?)

So, this guy here I assume is the line going to the fan. I disconnected it as shown to see if it would push air after start. Engine cold, idled until brakes, CTIS, etc were well pressurized and the air dryer was honking periodically. Nothing happened here at the solenoid. I tried the fording...

Couldn't leave it alone so I did some more troubleshooting. I think it's the solenoid. Plenty of pressure supplied on the manifold side, but none coming through the pipe to the fan clutch after starting up and letting it run for a while. Photos forthcoming...

1998 M1078A1. I've checked CB22 and it's fine. Checked the sender with a boil test and it works properly. The fording switch does not disengage the fan. I also tried shorting/unshorting the sender cable and it makes no difference. So either it's the solenoid failing, or the clutch is stuck. Will...

My LMTV radiator fan is stuck in the "engaged" setting, not sure where to begin troubleshooting so hopefully I can get started with a few questions for those who know these things better than I do. I'm guessing one of two things-- either the clutch is stuck or there is something borked...