Hello Forengemeinde, have recently a problem with cooling water loss on my Avensis 2.2dcat ( year 2007, 165000km ). After about 500 km I have to tip on it again and again well. Was therefore already with Toyota. A first visual test has revealed that both the ZK and the water pump are dense. Nevertheless, the first diagnosis of the master was probably the ZKD torn. To determine this one must probably expose the engine, because it could also be a crack somewhere the ( But if everything is dry, how is it supposed to work ?? ). Curiously, the phenomenon of the associated increased engine temperature (does something above normal, never into the upper third or the red area ) occurs only partially. Up to speed 120 nothing happens at all, since the temperature is as it should be. If I drive faster, so from speed 140, the needle sometimes (not always ) wanders slightly above normal. But this problem does not always occur, The engine temperature indicator stopped in the normal range. Question: If the ZKD would be the ZKD, the needle would have to move permanently towards the red area or not? And wouldn’t white smoke have to come out of the exhaust? Shouldn’t there be residues on the oil filling nozzle in the case of cracked ZKD? A workmate who himself bolts to everything that wheels has meant that it might be just the termostat that you could chmal ” hangs ” because also the power of the heater is very different. Sometimes I don’t get the place warm and on the other hand heats the properly. About suggestions and tips I would be very grateful… MfG