need help towing

[fordmugg]

i have a 03 f250 diesel...i have a 21' weekend warrior and a dirt bike...ok this is where i cant figure it out ive been to glamis plenty of times with no problem i just went to pismo beach last weekend and my truck sucked at towing some grades i was only going like 30 up and it was making a wierd noise like the fan keeped coming on witch ive never heard...all in all just sounded like the truck was struggling and im only towing about 7,000 pounds i hope someone has some answers for me on maybe what could be wrong

[bigcountrysg]

Is your truck a 7.3L or a 6.0L need to know being that the 03 had both engines in them. Early 03's had the 7.3L and the late 03's had the 6.0L in them. The engine is gonna make a difference on what the problem maybe.

[CLIPPERS]

Higher Altitude?

[fordmugg]

its the 6.0

[Evil Eye]

The sound is just your fan revving up because your truck is getting a bit warm. I'll bet when you were going to Glamis, it was in the winter months, huh? Now, since its summer, your hearing the noise... As far as your lack of power towing the hills, I'm not sure. What is your boost pressure? Are you smelling any coolant towing those long grades?

[2005F250]

Dirty airfilter?

[fordmugg]

well its an 03 and it doesnt have a boost pressure gauge so i dont know on that and also it was pretty cool going and comming to pismo

[LHMissions]

I pull heavy loads frequently all year through the mountians in Applachia. Its frequent the 6.0 fan will cycle on/off on the long grades up - under full load on a 12% grade giving the PSD all it has to hold 50mph - that engine does get hot. Hear it less in the winter months.