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Hello and thank you for your question,The common caused for the problem you are having is usually not a system being low of Freon but in most case its a failing passenger side air mix motor, there are two, one of the left side and one for the right . I would start with checking and replaced if needed. I have enclosed the replacement steps in the link below as well as the steps to test it and verify its failed. The air motor is on the AC/heater plenum right behind the glove box and is a pretty easy install as well. Have a look and post back if you have more questions and or need more help.https://dl.dropboxusercontent.com/u/104923897/Air%20mix%20motor%20Aug%203.pdfhttps://dl.dropboxusercontent.com/u/104923897/Air%20mix%20remove%20Aug%203.pdf