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I'm having the same issue with my W210. A very soft whistling or squeaking noise coming from the climate control vents. Only occurs with the A/C on. Doesn't happen in EC mode. Noise is very intermittant. Usually lasts 3 to 4 seconds at a time. I've had it to the dealer but they could'nt replicate the noise while it was there. Doesn't appear to be a squeaking blower motor.
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