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Was the truck ever certified as a NFPA vehicle?

Yea, out of stock. Midwest doesnt even list a price for one anymore, but they will sell you the one shown in the videos above for $300 with some fittings amd pigtail installed...

Well the default if it quits is fan on/running, so not a lot of liability. How deep are your pockets, last one I saw from any vendor was north of $600... i have a used one i will sell you...

Actually you want restriction if any on the outlet/vent port, and personally I don’t think it needs it. Remember the fan works inverse. It applies air to release the clutch. Like driving a manual, you want to release the clutch quickly by stepping quickly on the pedal(applying air). And you...

The part cross number for that sw 7N9785 says it trips at 225F which is a little high… it is normally closed though, which is the hard part of this equation. there are lots of automotive coolant/fan control switches out there, but most all are normally open until they reach set temp. You...

OK reviewing the schematics I think you have 2 things going on: 1. The fan control thermal switch is bad and when it is hitting 200F, it is removing power from the solenoid, but at the same time switching it to ground. The fan power is drawn thru CB22, but that gets power from the switched...

That most definitely sounds like wiring or a component issue. As Colt mentioned the 200f thermal sw removes power from the circuit to de-energize the coil of the solenoid valve, vent the clutch air and engage the fan. Not where I can look at a schematic right now, but will look later this...