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Once the heater control unit is removed then the connections for the knob which probably was loose at one time. There are 3 connections that break off. This is repairable by a skilled solderer as they are very close together. Otherwise it is 500+ from dealer and you don't get the whole unit, so it takes some gentleness to dissassemble that too. You might be able to find a cheaper fixed unit but I don't know of any.
Yes, I know the answer. The wires on the heat control knob have come loose from the main circuit board. It is a ERY expensive part to replace. However, you can repair it, if you, or somebody you know, can solder wires. You will need to remove the AC amplifier assembly, and disassemble it. it is apart, you will se 1 or 2 broken wires on the control knob circuit board that connects to the main board. Resolder them, and you are good to go.
You have a broken wire connection between the temperature control knob and the circuit board behind the center dash console. Vibration causes the failure and once the control knob gets loose the solder connection fails.
For someone that knows how to remove the dash unit and can re-solder a couple of new wires this fix should take no more than 1 hour. Make sure that you apply loctite to the heat control knob spindle nut when you re-assemble it.
The dealer quoted me 750 dollars to fix this issue and I found out that it's a common failure for this year. I fixed mine virtually for free but it took some tools and about an hour of my time.