Well, done. I screwed everything back together today after receiving the cooler. It's a little difficult to get to various hoses and clamps, but patience was the key. It started immediately and started running straight away without any error messages. I also installed a new battery, I had to train it, and then I deleted the error memory with at least 30 errors that had accumulated. Only the error with the exhaust gas temperature sensor remained, but is not displayed. I do this difficult work in the summer; it is often explained very well here in the forum. So, the car is washed afterwards and the air conditioning is refilled on Monday (to replace the water cooler you have to remove the air conditioning condenser). Have a nice weekend from Düsseldorf. L405 SDV8 2017 + Lancia Flavia Coupe 1964 + RRS L494 3.0 SDV6 + C220CDI Convertible 2021