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04 F250 coolant loss
Have a 2004 F250 6.0L. Problems started at about 170K.
Coolant was leaking. Found cracks in expansion tank and replaced. Had to add more coolant a few days after. Had the system pressure checked and all hoses, etc. checked. Thought the problem was solved. Went a week with no sign of loss.
Took the truck on vacation and drove about 600 miles the first day. Next morning checked coolant and bottle was very low. Added almost a gallon. Drove another 400 or so miles with just a slight coolant loss. Will tell majority of drive was just to cross Texas and was very hot. Seemed too lessen as we got into cooler areas.
Spent almost a week in the mountains with limited driving, coolant level stayed where it should. Decided to drive straight through on way home. Checked coolant occasionally after meal breaks. Seemed fine. After getting home checked coolant next day and bottle was almost empty. Had to add over a gallon.
Coolant loss seems to only happen while being driven especially on high mileage drives. No leakage on ground at all, no white smoke, no overheating, runs smooth. Have noticed a few white spots on top of bottle periodically.