I have a 2008 Durango SLT and I am only getting blowing from the front vents. When selecting bi-level, floor, and defrost I can hear the doors moving but it sounds like they aren't moving all the way. I thinking it's the blend door motor. Any idea how you get it out? I took the glove box apart and the center stack and I can see it but can't get to it. Any help would be great. Thanks.