Need a diagnosis.
I have a 2005 F250 diesel. I have noted for a year or so only when towing an 8000 lb boat/trailer that at times when going 55-75 mph I will hear what sounds like a fan come on and the engine temp will temporarily go up near the high range, but not to it. I note some loss of power even if I rev the engine. After as much as 30 seconds the fan noise goes off and normal power returns. It seems to do this more in hot weather. It has never done it when not towing. I also, immediately after my last service that I was short about 1.5 gallons of radiator fluid. I have not noticed any white smoke and do not have any radiator fluid collection in my garage.
I am the original owner and have 63k miles on it. Just had the tranny flushed thinking this might have something to do with it, but it made no difference.
Last edited by dogonenuts; 07-07-2011 at 05:40 PM.