I took it to Cerritos. There is a guy named Mike there that races for Hummer and knows everything there is to know. I just drove it in without an appointment and he stopped everything and fixed it.
He took the rubber piping off from the fan to access the water valve, which I believe sits rather low inside the compartment. He basically just unstuck it. I'm not sure if he lubed it somehow but there was nothing to replace. 5 minutes tops and now I have hot air. You probably have the same problem so either try it yourself or let them deal with it.
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