2002-2009 Cummins 5.9L/6.7L 3rd Gen Dual Zone Blend Door Set (DT-4DR-Y)

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2002-2009 Cummins 5.9L/6.7L 3rd Gen Dual Zone Blend Door Set (DT-4DR-Y) This is a set of the two-piece upper and two-piece lower blend doors for a dual zone system. These are the d oors in the center of the box that are above and below the heater core and control your temperature. All parts are CNC machined from solid aluminum and are guaranteed for life. Our doors will only fit our aluminum drivers. We have had several customers contact us because they were replacing our competitors failing doors and they could not get their drivers to fit our doors. You must use our aluminum drivers with our doors. Show more