Have a small problem with my cooling liquid. It disappears, but so minimal that you can only see the loss after a week (600 km), if you look closely, in the balance tank the water level then fell about 1-2 mm. But where is it gone? No recognizable leak, but have found clear marten bite marks on a cooler hose. In the oil is no water and the other way around also not. One advice? Head gasket should not be it according to the workshop, that was my first suspicion. MfG Olive r