Dont go under your car, it will just blow the crap into your evap,.. go under your passenger side dash and follow the evap(looks like a black box) to a point in the fire wall, there will be a hose attached there, from ther only there grab a air compressor and pull the hose off the evap and blow the air from there so it goes outside, you might have to pull your pass carpet to get to it, good luck