750 l1 2006 my ac is not blowing at full power. Sometimes when I get in it will on 2006 BMW 750Li

Blow at full and others it feels like it is on low. I have all settings correct and even the max button will not blow at full strength. This happens about 60% of the time I am in my car

Asked by for the 2006 BMW 750Li
Is your temperature gauge within normal range? Have refrigerant level check & measure to see if state of charge is low? Possible leak causing it to cool at first then blows warm. Good luck!