Hello guys, can someone tell me how the fan connections of the interior fan are switched under the glove compartment? The Puster regularly fails and jumps arbitrarily again. A system behind it is not recognizable. We could not provoke any wobble contacts. We removed the engine yesterday and cleaned everything. Defects are not visible. Collector and coals look good. Bearings run easily. To circle the sporadic error, I want to measure or connect a test lamp to the supply line before we expand the whole switch element. Can the controller be also? The fan box has 3 connections, which go inside on the controller. And the other side probably to the blower step switch Only what is what and how occupied? Plus, mass and control line? A circuit diagram of the overall circuit with the ventilation step switch would be great.