I too have a somewhat similar problem on my wife's H3. The other day we were driving down the Interstate and the outside temp was between 35 - 40 degrees. The display was reading the correct temperature but everyone once and a while "ICE" would display. I looked in the owners manual and found nothing so I contacted the dealership and they had no idea what I was talking about. We live in Louisiana and the temperature rarely dips below 35 so is this a common problem with the Hummer line? And why does the "ICE" indication display?
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