I have no idea where its coming from. When it rains and then I go to drive it, it pours out from the heater box area. Its not coolant. I have held a hose to the window and cowl vent areas and not a drop of water hit the carpet. Only when I turn a hard corner, or stop does it pour out and I mean pour out. Any thoughts?

 

try jacking up the back corner of the truck then spraying water maybe the cowl has a hole in the front or side or you could pop off the cowl cover and inspect it yourself that is th eonly place i can think of water being able to get in

 

Cowl has a drain that gets clogged up. They then overflow into the cabin. Find the drain (corners of the cowls) and clear the drain and you will no longer have that overflow.

Note: You need to remove the wiper arms and cowl cover at the base of the windsheild.

 

Sweet, thanks guys for the help. I live in an area where there is a tone of debris falling from the sky from the trees. I'm sure its just plugged up.

 

Also check out your firewall. There are various grommets that may have wiggled loose.
Mac

 

I found out what was leaking. It was the fresh air supply for the heater/ac. There is a plastic housing that sticks up under the cowl. Of course you cant reach it from the outside, and you have to do a crap ton of work like discharge the AC, and remove the console, dash and other crap. SO, I managed to remove the cover to the blower motor on the inside so I could reach my hand up there with some silicone and patch it up. I also built a damn for the rain to drain towards the drivers side. It rained like crazy last night so If I have wet floorboards now I'm going to myself.

 

Blue was right as well. I think the combination of the two was it. It still leaked but about half as much, so I cleaned the small drain tube out and it hasn't leaked yet. NO water!