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You need a refrigerant recharge and a check for leaks in the a/c system. I just has this done last week in my 2006 X3 with 85k miles. I last had it done around 2 years ago, and neither time the leak could be found. When the refrigerant level drops, the passenger air will be warmer than the driver's. I don't know why, but that's how it is. It's not a dual zone AC.
It cost me over $200 US at the dealer.
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