I have a stock 77 F 250 that I am in the process of fixing back up. It has 90,000 original miles on it and is a standard cab. The problem that I am having is that when it rains or when I wash the truck I get water on the floor board that looks to be coming in from somewhere up behind the heater box. It runs down the firewall etc. Is there some kind of seam in there that seeps after a certain amout of time or years in this case. I know that there are 2 clean out holes (if you call them that) under the windshield seal that sometimes get clogged causing water to enter. I had the windshield replaced and these were clean. I am lost as to were to look next. Actually this is my sons truck that grandpa gave him when he was 2. He is now 6 and I have the privelage of driving it for the next 10 years and getting it in mint condition for him. Any help would be great. :usa:

Ok, this may sound hoakie, but this is what had to do to customers cars,
Get a fire ext. and have a friend hose down the area (outside the truck) where you think the leak is, and you be inside and start looking for where the powder is coming in.

YOu can do that with water too, but i have the best resluts with a fire ext