Due to the design of the evaporator this happens when the ac charge is a little low. The E53 only uses 0.98 lbs refrigerant total so you don't need to lose much for it to start blowing warm. My suggestion would be to bring it to the dealer or a shop with an automatic ac machine to recover, vacuum and charge to the proper level (which will get it blowing right again) then do a leak check for you.

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