Keep the stock temperature thermostat. Running too low of a temperature will make the engine computer think that the engine has never warmed up (>170 degrees) and the computer will try to compensate by keeping the mixture on the rich side.
If you really are running too hot, there's another problem beside the thermostat temperature.
Jack may chime in here and proabably has some good advice, since he tows a trailer in Arizona.
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2007 F150 XL, 4.6, Regular Cab, Gryphon Installed 2/2009
"voiding warranties since 1979"
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Mon, May 25th, 2009, 03:13 PM
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