are the buttons physically broken, ie.fallen out ect? or do they just not do anything when pushing them? my old mk3 supra had a heap of dry solder joins in the back of he a/c control panel, just pulled it apart, re-touched all the solder joins and it was like a brand new one, had all fan speeds, heater worked, could change vents and everything, apparently i was common in them rigs, may be similar in yours.
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