Yes, you can do that. In fact, I drill a hole in the sheet metal behind
the back seat to get at it.
Just a short burst; too much air and you'll blow seals or swing booties.
Better use a pipe cleaner or a piece of wire. Try not to push dirt in it.
Behind the air vent are located the input and output shaft bearings and you
risk to damage them if grit reaches them.
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