I don't understand why that dial is there either. It overrides the temp you set for the vents only it seems. I really should read the manual to understand this better.
As you say it seems redundant at best, poorly designed at worst. You already have to change two dials to alter the cabin temperature since left and right zones cannot be linked (that I can tell) so now we have three setting we have to alter whenever we want to adjust the temperature. Perhaps there is something I am missing. Any tips welcome.
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