This is my first post to the forum. I have looked through here before though and have found a lot of useful information. I have a problem with the rear a/c working. It does nothing but blow hot air. The front seems to work just fine and all the positions on the controls work when they should. Late last summer I had to put in a small amount of freon because it was starting to cycle too much and then quit all together. A quick shot of R and it was working fine again. One of my kids that sits in the back will get sick if it gets too hot and stuffy so I really need to get it working and with the economy and all I will fix it myself. I have worked in the automotive field for about 20 years but the last 15 I was doing auto glass so I am not afraid to dig into anything. Any suggestions or help would be appreciated very much.