At least it was something minor, and you got a new radiator out of it.The 80 got a little hot the week before while driving and caused the AC to shut down, quick check of the temps saw the truck hovering a little over the 220 mark. Not good. After getting home I did a quick check of everything and did not notice anything out of place.
I was never really happy with the engine coolant temps on the truck prior to this but, this spooked me a bit. So after a little research, I decided to swap in a TYC radiator to replace my Koyo that is 6 years old. (It did not keep the rig as cool as I would like, it wasn't unusual for the temps to reach 210 or so.) So I swapped it in and did a transmission fluid flush at the same time.
Well after pulling the grill, I found the reason the rig got warm. A piece of black plastic had lodged itself between the transmission cooler and the radiator! It was a little over 10" by 12" laying flat against the face of the radiator, no wonder it got warm. I should have seen it while giving it the once over, I need to be more observant.
Yes, 6 years is not too old but I would have replaced it at 10 years of age anyway. Got a chance to do a little cleaning while I was in there. Now I just have to figure out how to stop the power steering reservoir from leaking.At least it was something minor, and you got a new radiator out of it.