And I've reached this point of the project:

tenor.gif

Last week I thought I had the cooling system solved, this weekend, I'm overheating again. I either have another stuck/plugged thermostat, or I have air that is preventing the system from circulating. I used my laser thermometer to get surface temps at different points in the cooling system. The inlet to the block where the thermostat is tells the whole story.

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My gut tells me the thermostat is stuck, because if it was open, there would be better convective heat transfer through the area. The profile looks more like conductive heat transfer. I think I'll pull the thermostat next weekend and see if it looks plugged up.