It takes just a few minutes to check the floor pans - so just ask. For the cowl vents, you'll also need to ask them first before you do this to save them the trouble of clean up (the owner should know if it leaks - cant hide that fact) ...fill up a 1/2 gallon milk jug w/water and have someone pour it (
slowly) right into the outside vents while your inside on the ds/PS floor looking up with a flash-light. The DS vent couples itself to a floor vent above the high beam flow switch w/ a small knob; while the PS goes right into the end of the heater box...cant miss it - neither will you miss the flood if its leaking....
This repair itself introduced me to the "joy" of drilling out over 150 spot welds...I learned the hard way - so Im trying to save you the hassle...