Can someone please advise - just had my a/c recharged and it is blowing cold air on pass side but hot on drivers side - what should be checked
Thanks

It's probably undercharged. That is the usual cause of this problem.

There could also be a fault in the duovalve or its wiring, or in the climate-control pushbutton-unit N22.

Fault in the duovalve is generally characterized by warm air from the side vents and cold air from the center vents. Your symptoms seem to point to under charged system.

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I posted this recently, might help if you suspect the duovalve

http://mbclub.co.uk/forums/showthread.php?p=248584#post248584