I've searched on here for some answers and this is the first time I have came up empty handed. My problem is on my 1997 GTP with the DCC. It's not switching any of the venting positions either in AUTO or MANUAL modes. It seems to be splitting the air evenly to the defrost,vent, and floor. Not a big deal since I bought it for a work car, but it would be nice to get it fixed if it's not too expensive. I thought I would see where you guys think I ought to start looking before I tear into it this weekend. Is this still controlled by vacuum like other GM cars?