It's a problem in gliding - air vents mean the cockpit slightly pressurises, and this then leaks out in undesirable places such as around the canopy and wing roots. A lot of people are experimenting with air 'exhausts' now to encourage the air to leave in one (planned) place to improve performance.
I meant air exhausts of course and they are normally hidden behind the rear bumper side trim or in the rear door shuts. Not sure where they are on the A3....
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