Monte,
THANK YOU! Like I said, shortly after the fans are on (only guessing, because temps drop rapidly under consistant conditions) the temps drop to normal. Would you be able to do a tune with snow plowing in mind? I am pleased with the 87 tune and 4cyl. delete, just dont know what else to do ...

I want to lower my fan temp settings on my 2010 silverado 1500 5.3. I have a stock t-stat. The reason is I plow with this truck and the temp guage will rise to the 0 in 210, and tranny temp will rise to 210-212, until fans come on. Any help would be great. Also, do i need to re-load stock tune first ...

Same here, finally unpluged it and tried updating via "ignition". It seemed to work. Now it wont upload a tune to car, will fortunately return the stock tune. Seems to jump all over the place, while trying to do a tune, ie. chose 87 tune, tire size, speed limiter, then it jumps to screen asking if i ...