I bought a 6600 combine. Has over heated from the day I got it. Ive changed air filter, thermostat, rebuilt water pump, changed water pump and fan belts along with tensioners, and had the radiator cleaned. The man who cleaned it said the inside was pretty clean but outside was dirty. We through it back on today and still same issue. We drove it 7 miles to the field and it ran at 170 degrees, then after one pass around a 20 acre field it was up to 185 degrees, and then after the second pass it went up to 195 anf then after the third 210 at which point we shut it down. It does not seem to smoke bad or act under powered and I do not see bubbles or hissing in regards to being a bad head. Hoping somebody has an idea cause I'm running short and its getting really frustrating at this point