I have an 06 f350 6spd ccsb with a 6.0 in it. It has a bully dog programmer on it. It usually gets left in tow mode. On my last trip I was hauling my camper full of gear (2500 lbs.) and a small utility trailer (1000 lbs). After a long haul up a hill my caoolant temp would increase and as as soon as it hit 210* the programmer cut the power mode down to stock and it said "defueling coolant". After that the coolant temp would drop down about 20-25* for a coupl;e minutes then heat back up to within 7-9*. Wondering what this defueling mode does and what could be causing the different temps in the oil and coolant ? Could I have a problem here ?