Well, it looks like it's new radiator time. I'm losing about half a gallon of coolant a week, the cab isn't heating up like it should (no heater core leaking or blockage) and the other morning I noticed a few puffs of steam coming up while at a stop light. It is however, still keeping the temps down and consistent.
What a POS this OEM radiator is! It's only lasted 170,000 miles, ten of which were Las Vegas summers, and 4 1/2 years in NC. Only two winters in the NC mountains where it was often a balmy 10 degrees or lower.
I guess I'll roll the dice and take a chance on another OEM unit.........