pods or pod control unit toast.
Pull glovebox insides and test all the vacuum lines coming from the control unit. Can't miss it.

I feel for you...I only got my A/C working last week and have been surviving the Arizona heat for the last few months.

http://www.peachparts.com/shopforum/tech-help/318178-c-r134a-pressures-too-high-im-lost-ideas-3.html
Post #43 for pod testing
Post #61 for pod replacement

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k