Looking for some guidance please! Today I decided to drain and flush the coolant on my 1070. Straight forward job. I successfully drained the antifreeze, filled with water and a commercial flush solution and started the engine to let it warm up and start circulating the flush. It took a good 20-25 min for it to warm enough for the thermostat to open and for the water to circulate. I then added more water, capped the radiator and let it run for another 10 min per the instructions before draining the flush. Instructions say to repeat the process with clean water to rinse out the flush completely and that's where the problem began. I filled the system up with water, started the tractor and waited for the thermostat to open and circulate the water. I waited. And I waited. I could not get this thing warm enough for the thermostat to again open! I let it sit running at 2200rpm FOR TWO HOURS before it finally got dark and I had to call it a day. Help! Dash gage indicates its running cool, water in radiator is warm, but not too hot to touch and exhaust is nice and comfortably warm to hold hand on. What do I do to get this thing to circulate and rinse out the flush residue? Thanks in advance!