I am in need of some advise I have a problem with coolant leaking out of my expansion tank (2001 tdi beetle) I have been reading and I think that most people would say head gasket but last night when i got home from work I removed my rad cap to relive the pressure and then put it back on, then this morning under my car the antfreeze had still leaked out if it was a head gasket and by removing the rad cap should that not have relived the pressure so that I would not have lost the antifreeze? I have 310000km on the car the head was off at 200000 when the last timming belt was changed, the water pump and thermostate are original. anyone have any idea's?