I'd take a vacuum cleaner and vacuum out those little air holes above the overhead grab handles in the front seats. Behind those small holes are the cabin temp sensor fans and they are notorious for seizing up and setting trouble codes in the ECC (A/C computer...). They might have just seized for a few minutes and worked themselves free, but left alone they will aquire too much dust on them and seize up permanently. Other than that you can cycle through the vent settings once in a while to keep the actuator arm free. Good luck.
Mike
'95 850T
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