I'm gonna find a hole and I'm gonna hear something bubbling

Ay community of the aluminists,

Is there a suitable hole in the A8 of the first series on the spray wall to the engine compartment, through which I can place the external GPS antenna from inside behind the steering wheel to outside through the water box on the hood? Well, of course there are, but is there one thing you can get to?
The TomTom is in the left corner of the window above the small ventilation grid...

And one more question...
When I start it in the morning, I feel like there's a little short splash coming from the back right or something, like a cooling water hose isn't fully ventilated.

He doesn't have any circulation to the backseat, does he? Come on, say it's not true. I've already come to terms with 8 single ignition coils, but I can't imagine that.
Uh.
So if that's not the case, what is it?

Sandman