The PO of my truck had the windscreen replaced and they didn’t do a good job of it. The problem I’m trying to work right now is that it seems that the bottom center 6” or so isn’t fully sealed. When I’m at speed wind is blasting up inside the windscreen, and when it’s raining it carries the water with it.

My plan is to remove the lower windshield cowl as per the AB video and seal it up. What do I use for that? I know butyl is typically used but can’t seem to find it (at least not locally). Is there another term for it? Do I have to use butyl or for this “quick fix” will another sealant/caulk work?

 

Ah, such a familiar story. We had that same issue when we first got our disco. The fix wasn’t the windshield sealing, but instead was making sure the windshield cowling was sealed flush against the base of the windshield. The gap allows bulk rain water to get into the blower, which then can get pushed up into the vents at the base of the windshield. Check that first.

 

Was the wind/water coming from the vent slots or the gap between the dash and the windshield? Mine is coming from the gap, I can reach down and feel some Rubbery sealant with my fingers? I’ve used some sealant on the cowling and think that it’s OK. I’ll have to double check it.

 

Just to follow up, I think I've got it solved unless something very bizarre is happening. I removed the lower windshield cowl (pretty easy per the AB video) mine had a bolt in the center that they didn't talk about, but it was easy enough to figure out and remove. To find the suspected gaps I put my light inside pointed towards the gap between the windshield and the dash. I then slid a piece of cardboard along the lower edge of the windshield and looked for where light shined through. As I suspected there was a large gap about 6" long in the center along with a few other much smaller gaps. I used a tube of DAP window sealant because a) it's what I had in the garage and b) it comes in a small flexible tube which let me get the nozzle down and around to where it needed to go. I was also able to do the D1 wiper retrofit while I was at it, so that was a bonus.


The sealant applies as white, you can see where I put it on in the center. All that space was just an open gap to the inside.

The "technique." Flashlight inside pointing down with a piece of cardboard taped to the windshield to block the light from my eyes. I then slid a small piece of cardboard along the bottom and look for light, as you can see circled in blue.