Hi friends, with me, the “check engine” lamp lights up on a long descent. The radiator counter is at the very bottom. In addition, it is constantly too low at cold outside temperatures. I assume that the thermostat is broken. Now I can put a cardboard in front of me – like with the Trabbi. But this is only a help. I would rather pack the evil at the root. Drum my request: Can someone give me a guide on how to exchange the cooler thermostat myself ? Thank you in advance! s-frit