7.3 Powerstroke Power Loss and Whooshing Sound at Part Throttle

[crf250guy]

The situation became very clear to me when I changed my water pump and was flushing the cooling system last spring. With my cold air intake, large exhaust, and sub freezing weather, the engine in my truck will not stay warm under light load, period. Just to get the thermostat to open, I had to go climb a few hills under full power.

Not sure if this helps you guys, but in my case, the truck is just trying to keep itself warmed up.

[jesilvas]

You can try putting in a 203* thermostat. Might help it stay a bit warmer