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05 X 6.0 diesel, towing a 9,000 trailer and it started overheating on the road yesterday. It's been fine for the past year - not a new trailer for this vehicle. Doesn't overheat without the trailer.
New Fan clutch last year
New water pump
coolant flush and fill when it was bullet proofed
no leaks, coolant full
only overheats under load (trailer)
e fan running according to tourque
Oil / coolant delta is within 10 degrees
it is throwing code Po480 which is a E. Cooling fan error but I can hear the fan running.
Replaced the thermostat yesterday & refilled the system (it was full).