This might be useful:
http://sites.google.com/site/mikefocke2/undocumentedacdiagnostics
If you have foam coming out the vents your mix flap is toast. Even if you get the refrigeration working properly it will not give you proper A/C due to the failed flap. A DIY was posted awhile ago but I could not find it.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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