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As requested by ezgn, the Borg Warner fast idle thermal switch is BWD WT7266. I purchased it at the local Carquest (Advanced Auto) for just under $74. That included tax along with $6 to ship it from Kansas to Michigan.

Some news to report, my son and I drained the coolant system and got the fast idle temp switch replaced. Flushed the coolant system and drained a 2nd time. Cleaned the overflow tank and re-installed. Filled with fresh Prestone green and distilled water. Fast idle/IP advance now works as it should!

Thanks for the advice. I will locate a solenoid to keep on hand. With that said, I just ordered a new thermal switch from the local parts store (Borg Warner equivalent of the AC Delco) - wasn't too bad at $60 compared to what I saw on the net for prices. Any advice on the other issues?

Well I finally went ahead and purchased a M1009 - a 1986 with 49,000 miles. My boys and I are going to fix it up and treat it like a father and son project. In any event, we are going to start with the simple fluid/filter changes and progress from there. The vehicle is in decent...