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I would start out by wire probing using something stiff say around 1/8" diameter through the fins and see how many are open, or can force out some rust and open up channels. Then you might consider using something like a pistol cleaning rod with wire brush tip or bore snake to work through the...

Yes, air should pass from one side to the other and exit out through the louvered shutters. You should be able to feel significant air flowing out the shutters after they have opened up when running. You should also be able to see some daylight between the "Cylinders" in the middle where the...

Can you take photo's (or use your GoPro while running) to show us your unit from all angles? It might help to spot something obvious and to further confirm what cooling ductwork sheet metal might be missing.

Good thought...however in his first post he did mention: "...cap set to "open" (was in closed, new)".

If the low oil pressure switch is bypassed and its only shutting down under sustained high load & restarts when cooled off, it sure seems to point towards the High Temp switch being activated. Even if the shutters are opening properly you still need to check for any restrictions behind the...

Are your shutter louvers opening after it warms up with a good load on it? You said it was 87 F outside and was running at 75% load when it died. At that temperature and load I would expect that the shutters would open up quite a bit...at least ~75% open. If there were any significant cooling...