what year is yours? Looks like a black access panel. I don't have that on mine.... Could be the source of leak. Water can leak down from the large channel at bottom of windshield between firewall weld and lower windshield panel. There is a seam that runs along just in front of where the windshield heater plug locating tab is. Mine leaked there but it ran down into the engine bay. Maybe yours is running behind that panel....??

 

I don’t think it’s the AC drain. I am getting a condensation puddle below the truck and it only drops when it rains or when I put a hose on the roof.

Mine is an ‘01. What is that access panel? Is it a bad idea to open it up and see what’s going on?

 

well shoot, I have access panel too! Never noticed it..... In your pic you can see the water running down the access panel face....

anyway, I spotted a seam leak here a few weeks back and filled the seam with RTV. The water was running down over the access panel. Panel could have been leaking at top ....

 

Well we are in the right area.




The leak is around the access panel. But it’s not coming in from above it. It seems to be coming from the inside of the panel.





I found this above the channel which seems like it could have be leaking down into the access panel.

 

yep, looks like you found it. a leak here could drip around the blower fan housing. Also, you can have a leak around the fresh air intake scoop which is located just above the 'seam' in question, and that could fill the blower fan housing......

 

These cars were designed to drink water....

 

Well I think that got it! I ran the hose on top of the truck for quite a while and didn't notice any drips in the interior. I plan on washing the truck soon and we have some rain in the forecast. That will be the real test.

By the way, I really hate the way the uploader keeps rotating my photos.

 

They all have gills that we cannot see and when it is raining they open up and let water in. Those sneaky Brits.