My Kubota BX2680 was running warm when mowing in 90 degree plus Texas weather. I always clean the radiator screen before starting but it still was warmer than I thought that it should. I added wetter water and that helped a bit. Finally I noticed that the radiator was over half blocked by...
FWIW, I bought the same one as op and drumminj and am pleased with it. It was pretty heavy and I needed to get a friend to help me get it mounted. It does a good job of keeping the Texas sun off of me.
Years ago I experienced the low pressure with my well. The pump was running but when we pulled the well we found a crack in one of the pipe joints that basically kept the well from fully pressurizing. It was a simple fix once we found the crack. We did have to pull the pump, all 300 feet of it.