My understanding as well was that trapped air would cause overheating. It does seem like the thermostat is stuck open but I don’t know how that could be the case given it’s new, and since I screwed in the thermostat housing which can only be screwed in once the thermostat is properly seated. I had the same issue with the other (brand new Febi) thermostat that I removed. I’d figured that one was a dud but after testing it with boiling water, I confirmed that it was in fact working. I’m so confused and wondering if I ought to just remove the water pump and thermostat and reinstall. Any other ideas?
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