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I have a mercedes clk 320 which had the same problem with ac on and fan running even with key out of ignition. It was draining my battery daily. It turned out to be a bad blower motor and blower motor regulator. Fixed that, no problems since.Report it
These cars have a setting to keep the blower on after the car is turned off if you stay in the vehicle. You can find it in the driver settings.Report it
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