1/ do you mean the vent inside the dash specifically for the passenger ?
2/ the one on the output of the heater box that directs air to all the middle dash vents?
3/ or the exterior one between the outside of the car and the air box, on the passengers side. ?
A1/ put a small screw driver or bread and butter knife between the dash foam and the top and bottom side of the vent and gently pry it out, will come out about 10mm or so before becoming loose. rinse and repeat on a parts car and then press fit your replacement in, making sure the ducting lines up with the back of the vent of course.
2/ dash out to fix. wont detail here, plenty of info online for dash removal
3/ there is no such thing on E30s unless they have aircon and the recirc button in the HVAC panel. unfortunately, even on those with this, i have never had a failure in all my years so i dont know repair proceedure. interestingly, in my experience cars without aircon have a far higher rate of blower fan failure.
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