The AC isn't blowing very cold at all. Figure it needs to be charged. Trying to figure out how to charge up the AC on my 2001 PSD. If i go down to the auto parts store and pick up a couple of cans of freon or whatever their using these days....how do I put it in the lines and where?? This is all new to me, so I'd be starting from scratch...figured the best way to learn though was to actually do it myself, but i need some help, please. Anybody know?