a/c cuts off

[carl94bmw525]

When fan control knob is set at 3 in a/c, it cuts off eventhough it's still very hot inside the car. When I set it to 4 for about a minute then switch back to 3, it works again. Any clue?? Thanks

 

[epj3]

Very common problem; This should be fix

http://www.bmwe34.net/e34main/maintenance/electrical/sword.htm