Fan selector troubles

[Diezel]

Ok, so one day I was driving and went to change the aircon off the windscreen selection and it wouldn't change. The aircon and heater works on all speeds it just won't select anything other than the windscreen. Any help anyone??

[colgf]

You have a leak in the vacuum line to the controls somewhere , usually the little rubber hose that goes into the rear of the inlet manifold next to the brake booster vacuum line has come off or is cracked perished. Check for leaks under the dash area too in the rubber lines.