this area is the middle just left of the middle of the car, on the fire wall. (see the o2 sensor and the DP?) and is above the the rack, so looking it will be easiest from the top.
your own link says comes with a wet floor, but you said your floor is dry, so that is why i said heater core has air in it.
and i stand behind what i said about the pass side dash, THERE'S NO LIQUID behind the pass side dash, none at all. its all dead center.
flushing your heater core is free and easy step to follow. its worth a shot.
