Would my Duster run cooler with an electric puller fan?

I recently towed over the mountains, 89 350 Chev overheated on first attempt. I had removed my fan shroud because it was rubbing when the truck flexed, anyway, I had to drive back home and put it on. That and adding air to the tires and no problems pulling my RV over the pass to Leavenworth. Every little bit helps but it sounds like there's more going on than the shroud to me in this case. Good luck.