AC is blows cold on right center and far right side vents (up, middle and down positions) but left center-vent to far left blow luke warm air. The car has duel climate control. Any suggestions appreciated

Low refrigerant (freon) level is most likely. If that's not it, do a search for "duovalve." I went through the exact same thing with my '98 E-class a couple months ago.

Cheers, John

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'98 E300TD (W210) | Sold 6/09 with 205k and counting
'04 VW Touareg V10TDI