Ok so in my 98 I have had some issues recently and I can't get my ax controls to work right. Basically I think my problem is a blocked vacuum line but I'm not totally sure how to go about fixing it, the problem is when I turn on my air conditioning it comes out the defroster and some air to the floor and no matter what I do it won't switch to the vents. Anybody know what's wrong or how to fix it?