I have a 1991 Mercedes-Benz 350 SDL and my AC control unit is malfunctioning (my guess!) When I turn the AC on, instead of getting cold air flow from center and side vents, the cold air flow is coming from the upper vents toward the windsheild (which normally should have air flow for defrosting) and side vents only. At times the system functions normal (getting cold air flow from the center and side vents). Please advise. Thanks!
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