W124 Wind Screen Not Demisting

[vincenz]

All
When I select the fan position to windscreen on the dial on the right it no air is blow from the vents at the base of the wind screen. It works on all the other positions (feet, vents etc) just not on the windscreen / up arrow.

It does sound thought like air is trapped or 'squeeling' when I choose the windscreen / up arrow and the noise is coming from the left of the car.

Any ideas? I did do a search but it yielded nothing.

The car does NOT have aircon.

Thanks in advance.

 

[kth286]

has the knob been put on the wrong position ?

try different positions and see if ANY position gives air to the screen.