Hi I have a w209 2004 CLK 270 CDI Avantgarde and have a 'Booster Heater' option in my settings menu.
Its controllable by three settings; Automatic, off and A/C off.

I was wondering what specifically this does as I can't find it in my manual.

There is however an 'Automatic Heater' section in the manual which indicates that I should be able to set
on and off times for it but I don't seem to have these time options when I enable the 'Booster Heater'

Please help a confused MB owner.