I was thinking about adding another, but it wouldn't hurt to have my radiator cleaned and gone through to try that first.You'll be able to get it without plumbing through the rad if you don't want to. Going through the rad would solve it but sometimes you just can't. There is no reason not to either go for a much bigger cooler, or run two coolers, or even three. Depending on what you want to do, you could get a bigger cooler or add another one. Getting a smaller second cooler with its corresponding fan and mounting it under the truck is an option as well.