Odd temperature activities

BKCowGod said

First thing I did - the entire cooling system resembles Hi-C Ecto Cooler, just the way it should, but I guess you can never flush enough so I may do another run with a reverse flush. That first flush was how I discovered the previous owner blocked off the heater lines at the engine instead of just running a loop.

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If it looks clean, then great. But you never know. Some of them have crap built up in nooks and crannies and it can take more than once to get it all out. I've never really had confidence in many flush products, but I've found one that works. Blue Devil radiator flush. You can even drive it around a day or three. Now's the time since there's no chance of freezing, since you have to run it with plain water.