Rain water passenger side inside firewall/floor board, 1981 k20
 

I dont have any carpet, stripped out, metal floor

When it rains water drips/running down from inside firewall to floor. Felt/cardboard insulation damp on inside firewall too.

I was going to pull the cowl piece( between hood and windshield) and plastic screens to search for leak source

Anyone know what exactly is leaking rain water in?

Re: Rain water passenger side inside firewall/floor board, 1981 k20
 

My first suspect would be the seam above the blue arrow.

Second place would be inside the cowl.

Attachment 2313757

Re: Rain water passenger side inside firewall/floor board, 1981 k20
 

Also check the windshield seal, especially the corners.

Re: Rain water passenger side inside firewall/floor board, 1981 k20
 

I have the same issue with my 81 C10.

Re: Rain water passenger side inside firewall/floor board, 1981 k20
 

I'm working on this issue currently I pulled the cowl and found a bunch of dirt and such.

Also the seal between the floor and the firewall is/was cracked and brittle i have taken all of that out and working on putting rust inhibitor, POR-15 and 3M sealant down. I'm not totally done but definatly sure this isn't helping the water flow out.

here is a link to my post with a few pics of what i found.

http://67-72chevytrucks.com/vboard/s...d.php?t=848593

Re: Rain water passenger side inside firewall/floor board, 1981 k20
 

I've had one leak thru the a/c housing stud going thru the firewall as well.