Owners Saab 9-3 OG models have big problems with A/C & Heater Controls, specifically with Heating Knob – the knob snapped off.
The problem is that they can not buy just this button, the problem is that they can not buy only the buttons, but the whole unit.
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Yet there is a solution, easy and inexpensive – 3D printed Heating Knob.
This project can be found at Thingiverse, and the author is Carlos Nergiza. Simply download the 3D file for printing, and take it to someone who has a 3D printer (this part is licensed under the Creative Commons – Attribution license.).