Hello Leutz I drive to Croatia with the caravan in the summer. Since I had a lot of problems with my coolant temperature on the return trip from Fehmarn last summer. I wanted a little prevention. On the one hand he gets a new water pump with the nine tooth rims. Then I wanted to remove the water cooler and spout. In doing so, deposits are to be solved naturally. I wanted to take vinegar, but am not sure if this can be done with the allu from the cooler. After that, I will disassemble the blower and the fans. Then I’ll fill everything with a cold cleaner and free bubbles with the high-pressure cleaner. I want to achieve an optimum cooling performance with these measures, and hope that this will help me to get the cooling problem under control.