I wouldnt go as far as to say it doesn't work, but its a little tempramental.
It blows warm when the heater is on regardless of the setting. however as the heating starts to cut off (as the desired temperature is approached) it does work, ie will change from cold air to warm air.
Is there any easy way to make this permanently cold? My previous e 34 didn't have this wheel so blew cold all the time.
The car is uk spec 525, it has aircon if that makes a difference.