Amazing overheating problem...desperate

OK, that is a bit hard to follow, what with the stumps and pulling and all.....but I'd

"suspect a combustion leak"

1...Did this "just start" on it's own?

2...Did this start happening BEFORE or AFTER you replaced a water pump?

3...Suspect a combustion leak.

4...Does the heater work at low speed? This will give you a clue if the water pump is broke.

5...Also, I'd suspect a combustion leak