With the greatest of respect, I find this statement almost unbelievable....Hi,
My 2003 W209 CLK 320 heater blows cold air into the cabin when I go round corners.
The climate control system has no idea when you are turning corners, and the g forces generated when turning could not possible affect the a/c dampers. The car's accelerometers are used for ABS control.
There must be another cause of this unwanted cold air.