Join Date: Nov 2009
Location: Gaithersburg, MD
Mentioned: 36 Post(s)
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I would've expected a wiring problem first, but if you have eliminated that, then I would look at a (maybe partially) failed, or incompatible, controller module - despite it being new.
Are you sure the FCM was actually a problem? Did your fan stop running? If not, I would try swapping back. If so, maybe try a new controller.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...