Moin, with my XC90 D5 163PS an increasing coolant loss spreads with warning message. In the last 4 years I have probably balanced 2-3 times about a quarter to half liter of coolant loss and it was quiet again. But now I had to pour 4-5 times over the last 3 weeks already and have introduced the last time also a cooler sealant, which however did not show the desired effect. The warning message in the BC is created by the donor in the balancing tank, if the coolant level goes below minimum (my wife therefore already had 2x panic high 3). To my knowledge the cooling system then picks coolant out of the balance tank, if the engine has a corresponding temperature, the cooling hoses expand and accordingly more liquid is needed in the system. – Right? This morning I drove 50 km and parked the car for 6.5 hours. When I left again, but after 1 km came again the warning message and the cooling unit After the slow opening of the lid, the coolant bubbered back into the balance tank and stood almost at maximum. But why didn’t the coolant run back into the balance tank again within the downtime? – Can that be defective in the balance tank? Pressure and liquid compensation would have to be done in the cold state after all? Are the coolant hoses to be renewed after 10 years? Or do I have a completely false Vo I would be very grateful for relevant information. With warm greetings from the North German lowland woolgraeser PS: Heating works without problems by the way. Only the left side in the interior is not always as warm as the right side in the heating operation at 22 degrees, it flows cooler air than on the right side (wasn’t there anything with the damper motors? Does not always occur, if I put left on ‘full gas’, it will be there auc h really warm).