I have a problem with my ac/heater blower, I think. When on automatic it always blow on a high speed, not maximum, just high. I can push the "maximum" button and it will blow harder or I can push the "minimum" button and it will blow very slowly, but on automatic it never varies. This is my first Mercedes so I'm not sure if this is right or not.

Can anyone give me a clue.

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2000 Mercedes S500
1990 Mercedes 560SEL
1970 Triumph Spitfire