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UPDATE: Some of you guys were bang on, if i put the knob in a "low rpm" area and then push the AC button, it revs up to the same level that the "high rpm" area runs at. So the ECU receives a signal telling it to raise RPM because the AC will kick on. Thanks guys !

Good idea !

Ok sorry guys for the late reply, we had a thunderstorm 3 days ago that killed my internet modem and was replaced only today. So let's begin ! The vacuum thing could be a symptom of higher/lower RPM and not the actual cause. I'm not sure. Good guess, unfortunatly i have cut the belt...

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...