water in cab

[ol yellow 72]

i went out to take the seat out of my 72 yesterday and to my surpirze when i raised up the passanger seat, theres water bout 3 inches deep in the rear corner of my cab. 1st question is where could the water be comming from, i mean i know its rained recently so its leaked in from somewhere. 2nd question is would it be safe just to drill a drain hole and let it out so it can drain all the time???

[ChevLoRay]

These cabs are known for developing leaks and one of the prime sources is the area above the kick panel vents. Dirt, leaves, etc., accumulate and cause rust. It may not be showing at the vent, but leaking into the vent and onto the floor.

Door seals can deteriorate and let rain leak in, and if the door hinges are in bad shape, the door sags just a tad and the door seal isn't tight.

Windshield gaskets and back window gaskets can let rain seep in, but my bet is on the vent area. If you want to be sure, just run some water in the cowl vent and see where it comes out.

As for drilling a hole to let the water run through, I wouldn't but it isn't my truck. I'd opt for an inexpensive poly tarp and cover the cab and cowl to keep rain and melting snow/ice from leaking into the cab thru the cowl and/or the door seals.