My A6 (2.7 SE new in July 2008) has just started to only provide cool / cold air to the drivers side of the car (both driver centre vent and side vent), even when the temperature setting for the driver is set to high.

The passenger side can be set correctly to any required temperature, both hot and cold.

Is there an easy fix for this or does the car need to go back to the dealer - they can't do anything for two weeks! Are there any fuses etc that should be checked first?