Hello guys, have a problem (unfortunately in recent times with Benz first 1. belt disc, 2nd water pump, 3rd alternator, finally still main power distributor na that makes fun :-)), 2 days ago it happened without notice, after making out of engine and locking the car made the Benz noise (front left near splash water and cooling water tank) as similar as buzzing or huming of a hydraulic motor … after a short break the noises were gone, this happened exactly 3x at the evening. Now it doesn’t do that anymore but nothing happens if you now press the switch for the increase!!! Is that the engine of the level control or can even be only one hose defective ? Best Regards RSnake