2006 x type saloon demist function does not work

the demist function should be for the windscreen. the a/c should kick on and put out heat at the dash vents. the combination between the a/c and the heat allows the system to evaporate any moisture in the air allowing it to warm you and evaporate any moisture on the windscreen, and anywhere else they may have it duct to so that vision is not impaired. enjoy!