[steve00s]

I went through several months of this schizophrenic coolant tank behavior. One day I would have a pool of coolant in the trunk and garage floor, a week would go by with things fine and then a pool again. The cracks in the tank were behind and below so you could not visually see them (of course). The hoses are very difficult to get at in the engine compartment as there just is not much room. You do not say what year your car is but if it is older than the tank might be the culprit as Porsche has had many problems with the earlier tanks.