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Originally Posted by ketcat
From what I understand it is a common problem in this area and Jay at Lund Hummer is working on a larger aluminum radiator for the H3.
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No need for a larger radiator. It's not overheating under load. The problem is at low speeds, when there is low air flow. Best solution would be an electric pusher fan. I've noticed the A/C isn't the greatest at low speeds on hot days, too, so an electric fan would help there, too. It is too bad GM didn't include one, because then it could be programmed to turn off with higher vehicle speeds.
A larger (deeper radiator) will reduce A/C performance, because of the additional air restriction, unless they reduce the fin count, which would negate the extra depth.
Michael