OK guys, you'll never believe this. I finally flushed out the cooling system. The radiator was not stopped up. The block was, with rust. Looks like someone ran straight water in it before me. When the rust broke loose I had full flow. I let it run in the driveway for 30 minutes with the overflow hose out of the bottle. Not a drop. Put the hose back in the bottle and instantly started blowing coolant out of the vent hole. Took the hose back out, it stopped. I did this repeatedly with the same results. I can touch the block bare handed and not get burned. Is my tractor haunted?
Eugene