I have a 2008 Chevy Tahoe 5.3 liter flex fuel with auto climate control. I have noticed that the last week or so hearing the cooling fans run more often. Here is a for instance: Yesterday driving highway speeds (70ish). Out side temperature 17 degrees. Engine water temperature 210 degrees. Exit high way pull into gas station refill with engine running. Fans were on and stayed on the entire time. ( Approx. 10 minutes.) Should have they not cycled on and off as needed? When starting cold fans don't run. Please help. This truck will be taking a 3000 mile trip soon and want to make sure we are good to go! Thanks in advance.