[PsychoJJ]

GM air vents are always spitting air no matter what. Even when closed they still get a bit of air pushed through. Also even when the AC or heat isnt even on the vents will still pass air even when the unit isnt even on. Only thing I can think of that may be going on is there is a clog in the the system or a problem with a connection point in the system causeing only a fraction of air to be pushed through if any at all.