V6 Passats have a pump that circulates the coolant for a while after the hot engine has been turned off.
You sure you didn't mistake the pump moving the coolant in the bottle (which is very visible) for boiling?
As for the shifting, that is probably fine.
You sure you didn't mistake the pump moving the coolant in the bottle (which is very visible) for boiling?
As for the shifting, that is probably fine.