I have multiple trucks with the same problem. My 2000 F450 6 speed has a bad leak. When it rains i have to put a tarp over the windshield other wise I will end up with water on the floorboard and twice it bit me in the a**. A few years ago it backed into my other dump truck by itself cause the truck got wet. Then last year it backed into my '11 6.7. And my 2002 F250 will leak from the passenger handle really bad. The F450 has 250k the F250 has 303k. Do these trucks have a bad windshield or something?

 

common problem with these trucks as they get older. pull the windshield and closely inspect for holes. repair as needed, and then use the special windshield primer before having the new glass installed.

 

So I just replace the windshield then?

 

Nope, if you do not fix the holes and use the proper primer it will still leak.

 

If your windshield is 20 years old, I'd replace.... 20 years of nicks,scratches, etc.... windshields do get old & worn out.... you'll be amazed you can see again !

Depending on where ii is located, some leaks drip water onto computer, or fuse box, etc... You'll start having all sorts of weird things happening if that happens.