Re: 6.0 No Heat under load... :/
It could be just coincidence that it happens above 25psi. I had surging heat in mine during the winter and it ended up being the water pump. The 6.0s have a cheap plastic impeller and it will crack around the shaft and slip! I would change the thermostat if you get into draining the coolant system. I would think that if you had a blown head gasket that it would compress your coolant system and cause it to overheat. Just sharing my experience! good luck!
2003 F-250: 4 inch superlift on 35x12.50x20 nitto trail grapplers, Bilstein shocks, adjustable track bar, 6 inch black nickle plated stacks, 5.9L 12 valve CUMMINS with lots of goodies.
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