Hi, I’m a bit perplexed at the moment. I only had mine for a few days. had parked yesterday in a parking garage and pre-planned the heater. When I came to the car 20 minutes after the switch-on time, I saw there a water pool about 1 meter large under the car. It dripped at the front apron to the right. After I had switched off the heater, the drop subsided and stopped completely. This morning it was dry under the car, after the heater ran a few minutes, the drip went I can rule out cooling water, this is green and the container is full. Have a temopotuch kept under it, the water is colourless. If only the container of the windscreen washing system, which is also sitting over it, or one of the hoses to the headlights/windshield, have not noticed any waste of the filling quantity, but would be possible. Or is the condensation water? Would also explain why the water was cold, whereas cooling water and windscreen washing water j I am familiar with the subject of condensation water only from the air conditioning system. I have often been mentioned that the car drips. But if I were new, that this is also the case with a preheating system, I have already noticed the fourth vehicle with preheating system, I have never noticed before. Of course, if I wanted to, then I could spare myself the leak search… Who knows advice? lg Rüdiger:-)