Servus with each other, I have a strange phenomenon since yesterday morning. As soon as I turn the ignition, the cooler fan starts, runs at the highest level continuously, even during the ride. After turning off it runs on 3-4 minutes. This morning the car jumped badly on . After ignition speed at idle at 1500, i.e. slightly higher than usual, but adjusts within 2-3 seconds again to 1000 revolutions. No oil or cooling water loss. Climate has been empty for 2 years and is also out. Last winter we had the problem short term and the interior heating did not get really warm, which somehow “repaired” itself after a week. Can I go out of thermostat, temperature sensor or have to get panic at proud 310,000 km? Thanks for feedback