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Q:

Lost cabin vent control on 2006 Hyundai Sonata

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I've lost control of my heater/ac vents. The air flow is stuck on windshield defrost. The temperature control works fine as does the blower speed control. I just can't get heat to deflect to the floor or a/c to come out the dash vents. This condition started intermittently and has now become permanent. It seemed to start soon after my dealership replaced the cabin filter.
(1) Answer
Perhaps re-visit the dealer - hopefully it's a quick vacuum line repair.