Why is my a/c start when i change the fan blowing direction???

2006 MAZDA TRIBUTE
74,598 MILES • 4 CYL • 4WD • AUTOMATIC
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CHART023
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When the a/c button is off, and i switch for example the blower from the feet and front to the bottom winshield, it start the a/c on it's own.
What can be the cause?
Aug 14, 2012 at 1:35 PM
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WRENCHTECH
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That is supposed to do that. The A/C removes moisture from the air in defrost mode.
Aug 14, 2012 at 2:22 PM