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    RPM/Vacuum change when heater on foot or windshield

    Hi guys ! I'm quite mechanically inclined but have something puzzling me on my 2007 Mazda 3 2.0L. If i place the heater selection knob to face or face+foot, i've got a low idle speed and high intake vacuum. If i place the heater selection knob to foot, foot+window or window, i've got a sudden...
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