Not possible as far as I know. It's a pretty nice feature to have 2 independent controls. I've noticed that my pasengers who are used to manual controls tend to fiddle with the temp WAY more than they need to. Adjust the temp up or down a degree at a time then wait a couple minutes before making another change.

I leave mine on 72 year around. The only things I tend to adjust are the air director controls. I like to have warm legs in the Winter so I send all the heat to the floor unless I'm trying to defrost.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250