With out a little more info its hard to pin it down, however I will try. On my cardinal I have the controller to the AC/Furnace. Then to the right of it there is a controll box that controlls the automatic vent in the ceiling. This may look like a heat controller as it has temp. etc.
Thats my guess
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3500 Ram 5.9l diesel
08 35 RLT Cardinal
5th Airborne Pin Box
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