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Originally Posted by Michael1
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
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As I'm sure you know (sounds like you are mechanically inclined) if you ask three different engineers about cooling system theory you will get three different answers. Bigger radiator, offset rows, different fin designs, different coolant, coolant flow direction, fans etc..... Lot's of race teams are using the SMALLEST radiator they can run without overheating on the track.
The fact is any stock car should be able to idle in 110 (even 120) all day with the A/C on and never overheat or getting hot.
Because it appears to be a problem with most H3's in this area I thought it would be important for people to know someone is looking at one possible solution.
Personally mine has not overheated but if it did I would make the dealer fix it and if they didn't I would get GM involved.