on my 00 E430, when I turn off the fan to off, the air starts to blow from the windshield vents and the side vents. Tried all different settings, when the climate control fan is turned on to low or high the climate control works fine, but when I want to turn everything off, but turining the fan control to zero, all stops and then the air from the defrost vent and side vent start to blow air. This happens when the car is turned on. everything shuts off when the car is turned off.
any ideas ? just started happening today....

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Sounds like a problem with the electronic blower regulator.

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