Counter intuituive I know, but once parked up close the radiators and you'll not have any issues, seems to be the coolant being afterboiled by the residual heat in the engine, this tends to happen when engines are run with the minimal necessary coolant. Used to happen in my mates old Nissan quite regularly!
Shouldn;t happen all the time like it does in CloD though, but really, a minor niggle
V