After having my 2210 for 2 years I decided to do a fast flush on the radiator. I removed the antifreeze and filled the radiator with fresh water and added the flush as directed. Ran the tractor 15 min and drained . Filled with just fresh water and ran tractor for 15 min and drained(did this 3 times) The water still came out off color after 3 water flushes. Is this normal? I decide to go ahead and add new antifreeze and distill water at a 50/50 mix. I also use Fleet and it was a purple color diesel rated antifreeze. i did notice it does run a little cooler on 100% water versus the 50/50 mix. Anything I should do about the off color water next time?