The heater in my heater 240DL does work or doesn't. It either produces cold air or hot air (depending on the positins of the regulator swith in the dash). Once the switch is all the way to left it produces cold air. When I move it only a little to the right side it produces only hot air. There is nothing like warm or a little bit warm air.

I found (after removing the under dash panel) a mechanism that regulates the airtemp under the dash. Does anybody know how this thing works? Or waht is causing the problem? The cable is mounted properly and I can see things moving in the mechanism while adjusting the switch.

Thanks

-Maarten