It would depend on which vent it fell into. The surest way of getting at it would be to remove the dash.
The vents leads to the heater core and there are many areas where it could be trapped so it most probably won't drop to the bottom of the heater core housing but there is no harm trying. Check the lowest point of the heater core for openings and see if you can find it there. The carpets might have to be flipped up to check.
Wednesday, May 30th, 2012 AT 4:10 PM