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Need help with cooling issue!
I have a 2010 F250 w/ 63k miles.
Last week I noticed the motor side of the lower radiator hose leaking, So I replaced it. I also put on a new radiator cap per reading other opinions on the internet. The fluid that drained out looked pretty good and I noticed the the PO had changed the upper radiator hose (white plastic end). A few days later on the way home I heard the cooling fan kick in during normal driving. I was just thinking that was odd, then the temp gauge started climbing. I cranked the heat on, and got off the road. The heat was just blowing cold air. The lower hose had become disconnected at the bottom. I let it cool, put it back together poured in distilled water and drove the remaining few miles home. I then replaced the radiator side of lower hose thinking that was the problem. I also drained the oil to make sure it just had the 15 qts and no extra fluid.
Well, 278 miles later (5 days later) the cooling fan kicked in and cold air coming off out of the heater (outside temp was in the 40s). Luckily I was in the neighborhood and coasted home. This time the lower radiator hose at the radiator end came off. Except for today, I checked everytime I started the truck and the fluid in the reservoir was either between the fill lines when cold, or above the cold fill line when hot.
So, did I just not get the new radiator hose on tight enough, or is there something else I need to have checked? It's no fun to keep loosing expensive coolant. Before today I had not seen any leaks since the new hose installation nor added any additional water after the first day.