Welcome back:
It is possible. I hate to say it, but I feel the computer needs scanned for codes. This vehicle will provide codes related to the HVAC system. They are different than the typical P type engine codes. The problem is a scanner that can read all codes is needed. By any chance can you gain access to one? My concern is although I feel you may be right, I would hate to see you replace the module and find it isn't the issue. If I recall, it isn't a cheap item. Just to let you see what I see, look at the attached pics. They are specific climate control concerns. Each one is related to a different code. If you see anything there you feel fits what you are dealing with, please let me know. I'll be happy to provide the diagnostics for it.
Let me know.
Take care,
Joe
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Saturday, October 26th, 2019 AT 6:39 PM