It will be ok to run the fans all the time. The AC does make the fans run a good bit more than just the engine cooling. Sometimes my fans run all the time the AC is on(when it is hot outside) and sometimes the fans cycle when the AC is on. Mine senses AC pressure and adjust the fans acording to demand.
2006 Superior Blue Trailblazer SS AWD, Stock as a rock
Sold: 2002 GMC Sportside Denali front end with a 2002 LS1, FLT level 5, Yank 2600, Trick Turbo, T76, Nelson intercooler, 60LB injectors, Warbro fuel pump, Eaton locker, Magnaflow, 3.42, Nelson Performance Tuning (speed density).
Sold: 1981 GMC LB RC 1500 2002 4.8L 4L60E 12 bolt 3.73 Richmond Lock Right AC PS Nelson Performance tuning