Our dash air-duct dampers are controlled via vacuum. Because diesel engines don't produce a vacuum (when they run), "we" have to make a vacuum via a small pump mounted in the generator bay. There is also a small spherical ball (vacuum reservoir) there as well.....all inter-connected with black hoses. So check for a loose hose....or the vacuum motor not running (fuse?), etc.
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Robi & Dale ---- Go Navy ----
2016 Winnie TOUR 42'
Tow: '19 Buick Envision
or: '08 Buick Lucerne
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