My fatster has been permanently losing coolant since last year. I drive the rare BGJ V8. Unfortunately, nobody including me finds the leak. If I have warmed the box and then put it off, it drips at the front of the noise damping from the vents. The loss leads to the fact that I have to tilt half a litre every 4 weeks. It is not visible after disassembly of all the panels from above and below. The engine block and all the coolant lines are dry. Water pump also checked through the friendly. This has everything pulled out – nothing found (the car has been there twice!). It also does not smoke out white, so head seal OK. As well as because the coolant is under the car I have even turned the box on stage for 10 minutes at 5000 tours and two friends have illuminated everything under the car. The leak is undetectable! Even the balancing container around the lid is not wet. The heating works perfectly. You can find absolutely GAR NOTS that which is added to the loss of coolant or something else could happen to the problem.