rhagfo wrote:
You should never be above 190 without a load! Replace the T-stat as mentioned before with a Cummins T-stat. Make sure the outside of the radiator is clean and oil free, check the water pump, simple two bolt replacement.
I only got my 01 up to 205 pulling a 7% grade on a 95 degree day running at 19,000# GCVW.
I have to politely disagree with the 190 temp. Mine will run between 190 to just above 200 (according to the dash gauge) unloaded based on outside temperature.
To the OP, your fan will kick on and off periodically when running your AC on max(or recycle whichever term you prefer). This is in the computer by design. There is an electronic link to it. Many people have even tapped into it and put a manual switch so they can force the fan on whenever they want.
If your truck is not overheating you are ok. You need to worry if you have the AC on and never hear the fan come on.
