I've not looked at the boxster but other cars have the air diverter flap and they sometimes get stuck and not getting the full AC air diverted to the car interior.
Perhaps a bit of poking and prodding could reveal it that is what is occuring.
Here is a post about AC temps and under drive pulleys.
Underdrive Pulley Install Guide
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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