I was able to get mine out after soaking it with PB Blaster and gentle tightening/loosening. I put a bit antiseize on it afterwards. I’m not convinced tho it’s the best for place for bleeding the system- it sits well below the reservoir, so coolant comes out of it very early. I bled the system by idling on operating temperature for 5min with reservoir cap open - the level in reservoir is stable afterwards, but maybe I should still try to “burp” it. But I’m not too keen on opening it again - the bleeding nut is way too short for my liking and thread on it is not in the best shape.
