Take of the serpintine belt and try again. I have seen locked up accesories hang up enough to cause it.
What did you use to try turning it?
I have a rule about condemning an engine before seeing what is locked up, here it is: DON’T.
A locked up trans could do it to. You’re going to have to find the issue to know you are fixing it.
I seen a faulty fan clutch cause over heating, a new radiator went in first, but guy didn’t remove one of the plugs. Then when I looked at it I saw old fan clutch and had him swap it, then on test idle noticed no flow and told him to remove t stat and see ehat happens. I went on service call that finished my day and the next two I was off. I came back to him coming back from the office where they decided to just sell the truck for $1,000. 2 year old rig with about 80,000 miles on it. I looked into it out of interest after work, found the problem but owner of company was related to mechanic working on it and said- sell it anyways. I bought and flipped it for a fast $8k in 1 day. Good paycheck for me that week. Anyways just one example of people condemning too soon.