If you notice on sedans there are vents inside the car above the rear shelf. there are also vents outside at the same location. this is how the car is vented. the hoses drain away any moisture that collects in the metal channel between the inside and the outside.

you look at this and then you wonder why Volvo designed the 25 amp location the way they did, or the licence plate lamp holders that chip the paint when you remove them to change the bulbs, and the .......