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Unread 11-13-2009, 12:51 PM   #1
awful8484
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Fill a Fiberglass windshield?

I replaced my CJ stock heater with an aftermarket heater and plenum. The pressure out of the front vents is powerful but sucks with the defrost. I think it has to do with the windshield being hollow and wasting pressure around the inside. Testing my idea I took the pivots out and stuffed rags in the corners and tested the defrost, pressure went up great. My question is, is there a reason you need to keep it opened up? Can I fill the corners with silicone to keep the air to the defrost vents?

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Unread 11-13-2009, 01:17 PM   #2
CSP
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Personally I'd fill it with minimal expanding foam.
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Unread 11-13-2009, 01:34 PM   #3
Coiz
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The stock frame has small plates in the ends to keep the majority of the air in the defroster area rather than traveling up the sides of the frame rail. They are not perfectly air tight but obviously help. I would seal up the ends too.
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Unread 11-13-2009, 01:53 PM   #4
Mike Romain
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I think I would fill it. That said, I have an open POS aftermarket frame and went with the big GM Blazer blower motor and can defrost all the windows, even at -30C in a snowstorm. It will clear that little center triangle and we don't need gloves or hats when driving at those temps. It is 'soo' nice!

The Blazer blower is a cheap and easy upgrade. Jeep Heater Blower Motor Upgrade
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Unread 11-13-2009, 05:08 PM   #5
awful8484
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Thanks everyone. I like the foam idea.. Ill do that. As far as the blazer upgrade, my heater core assembly was shot and I wanted something far easier anyway.
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Unread 11-13-2009, 06:05 PM   #6
chet44
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That's what I did, the foam I mean. Worked out really well. Of course I have a fiberglass frame.
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Unread 11-13-2009, 10:10 PM   #7
awful8484
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Chet44, did you notice a big difference filling the sides in with your defrost power on the fiberglass windshield frame? Is it clearing the window faster?
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Unread 11-14-2009, 05:56 AM   #8
Mike Romain
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Quote:
Originally Posted by awful8484 View Post
I wanted something far easier anyway.
But you say you have no defrost power.... The GM blower defrosts 'all' the windows, front, sides and back, even with a hollow windshield frame....

What brand of heater did you use?
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
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Unread 11-14-2009, 08:02 AM   #9
chet44
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The only difference I noticed was that the windshield cleared up a little faster. I'm itching to do the blazer motor upgrade though.
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Unread 11-19-2010, 03:46 PM   #10
awful8484
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Update:

It has been a year and I finally got around to filling my fiberglass windshield with expanding foam. What a huge difference it makes to have the sides filled, the defrost rocks out now. Another plus to this is I found a little screw holes on the top that I didnt know were there. Maybe that was also a big part of the problem.

With the heater idea, I tossed my stock heater assembly and went with the Danhard assembly. It works, but I want better. When I can scratch up the cash I would like to find the whole stock heater plenum assembly and do the blazer motor upgrade. If anyone knows of a stock heater box, let me know.
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Unread 11-20-2010, 03:28 AM   #11
John Strenk
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Let me look around the barn a little...
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