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Check the freon lately? The high side port uses a rubber ball valve instead of using a schrader valve and leaks like crazy. GM actually recommends replacing the port every year because they are so prone to leaking.
I went through the same issue and thought mine was the blend door but instead the high side port had leaked all the freon out so I would start there first.
Just copy/pasted my response to another thread with the same issue a couple threads down. Anytime someone posts about ac issues, I always tell them to check this first before anything else.
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