Hello, I have had the phenomenon for a long time that in the cold and in the warm! condition comes an ever stronger clapping out of the engine room. The noise seems to come directly from below the ECO cover. Think that this can possibly also transmit itself. Have already tried to locate the noise (tickering – something like a sewing machine) with screwdriver. Also it seems to have become a little stronger in the course of time. Also the pulleys / rolls are already in a spring Here thread in conversation – but have been changed during timing belt exchange – no change Presumably it is the Hydros. How elaborate is it to change these? Greeting Christian