How about not using something that fails all the time?
Based on the experience of you two I would never buy or recommend Champion, even to someone I disliked. 🤷♂️
Obviously they can't get their together and produce a product that is fit for purpose, and both of you have told them there's a problem.
There's probably a billion ICE vehicles on the road. None of them would have made it past a 12 month 12k mile warranty.
It's obvious that building a radiator in a factory, that lasts has been a solved problem for 100 years.
I haven't ever changed a leaking radiator, except because a water pump failed and the fan took it out.
I still have the one from "the giving truck" hanging on the wall of the barn for -when-
Stop buying hype fueled garbage that doesn't work.
I've had two Champion radiators and they never leaked.
This is a bummer.
I'd probably buy a plastic tank radiator and wait for warranty on the aluminum one. Then you'd have a spare.