Help- Leaking water in passenger side floor board

[Jayman931]

Like the title says I have water coming into my cab onto my passenger floorboard. I did some water tests and it is coming in from below the windshield wiper...when water goes into the vent there. Does anyone know if there is a drainage tube that could be blocked up, or a hole that shouldn't be there? Any help would be great.

[Americanrider]

I'll bet it's a hole someone drilled for the radio coax cable. Go ahead and plug it. The water the comes in the grill/cowl opening is suppose to run to each side and down to the cowl drain opening that is inside the fender. (see red arrow)

[Jayman931]

I'll check the drain hole. As for someone drilling a hole. My truck has original am radio in it so i doubt anyone did any modifications to the firewall. I hope I can figure it out.

[Bishops Trucks]

Sonds like you might have a rust hole. Sometimes it's hard to determine where water is coming from as it will find away through the smallest of holes.

[BigFishBobby]

I just fixed the same thing on my truck. Remove the cowl (5 screws and 4 bolts). Once you pull it off, chances are you will find a spot of rust below the corner of your windshield. Both sides of my truck had water coming in. I was really worried considering the volume of water coming in, but it turned out to be minor. Also, check the antenna wire. I had to reseal mine. The old sealant just was too old and not cutting it anymore. Good luck.

[Critter]

It sounds like you have ruled out a leaky heater core, but I thought I would through it out there. I agree with the others. It's most likely a small rust hole hiding under the cowl.