There is a teardrop look to the vent/heater box under the pass carpet . you can pull it back and see it from the top. drill a small hole in the very center of the teardrop area and stick a coathanger thru and it will unclog the drain that goes into the frame rail then just a piece of tape over the plastic you drilled the hole in. At least thats how I remember it. I believe there was a T.S.B. on it.