Back in December I hit a bump and it aparently knocked the arm that opens the vent for the front defroster off of it's connecting point. I took the truck in and had it fixed. They charged me $115 ($9 for the connecting arm and $90 in labor) I had no problem pay it at the time since I had more money than time then. But yesterday the same damn thing happened. I have yet to call the dealer that did the repair work to jump on their case. But what I'd like to know is this common? Also I had the dash apart at one time but could not find an access point to where the connection arm connects to that particular vent trap. Anyone know how to get in and fix this? This is on a 91 K1500 Blazer LT.