Running defroster ducting from a Flex-alite- Mojave heater - JeepForum.com
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Unread 10-12-2011, 10:20 PM   #1
mulliflier
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Running defroster ducting from a Flex-alite- Mojave heater

Fellas,

Does the defroster in a regular CJ just blow air through th educt in the top of the body tub, fill the windshield frame and then out the diffuser?

The reason I ask, I installed a flex-a-lite Mojave heater in my CJ7, aluminum tub (haven't cut the holes yet for the defroster just behind the dash.)

The output is a 1.5" or 2" round on the heater plenum. The plastic defroster duct-to-body piece has an oval input. And, I only have 1 of them.

Since I haven't cut the holes in the body yet, I could just cut round holes, run round flexible hose off the plenum and split it, then run round house to the tub, and fasten it down with a pvc adapter or something.

Plus, don't you have to cut opening in the windshield-to-tub gasket for the air to flow through?

Anyone install a Mojave and have some good tips? I've searched the forum pretty well, and there is quite a bit on the summit racing heater and a few mentions of the Mojave, but no real details on what folks did for defrost ducting.

Thanks

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Unread 10-13-2011, 03:28 AM   #2
John Strenk
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Yes, that is how the CJ defrost works.

If it was me, and I was starting from Scratch, I would not use the original defrost duct with the oval connection. I would use some fabbing that would allow me to connect the round defrost tubed directly to the tub. Cut out round holes in the tub and then box it off with foam weather strip to contain it to the windshield.
You might want to attach your hoses before putting the dash on.

The guy who mounted my windshield on the tub put the holes in the wrong place and I had to box off my defrost ducts to get the air moving into the windshield. You could actually feel the air leaking out between the window frame and the tub before I boxed it in with foam weather stripping.




The windshield gasket already has cutouts to match the opening in the windshield.
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Unread 10-13-2011, 07:23 AM   #3
yahwhy
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I'm using the stock heater, but I had to route the defroster hoses different,cause of my gauge layout, just used one piece of spa tubing from lowes, tacked a piece of metal on to hold the tubing up, cut the slots,little silicone, works good, real good now that I did the blowermotor upgrade. You can see in the pic the windshield gasket is cut for defroster. Hope this might help.
053.jpg  
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Unread 10-13-2011, 07:54 AM   #4
mulliflier
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excellent, thanks, I will stick with round then., and just put round holes in the tub and go from there. Makes life easier in so many ways - now I can just use a hole saw. I just hope the little Mojave actually puts out some heat; I think I would have gone with the Summit but I didn't live in CO back then...

Thanks guys. I'll post images when I install the duct, in case anyone else ends up serarching for Mojave.
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Unread 10-13-2011, 08:11 AM   #5
Jp78cj5
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Quote:
Originally Posted by yahwhy View Post
I'm using the stock heater, but I had to route the defroster hoses different,cause of my gauge layout, just used one piece of spa tubing from lowes, tacked a piece of metal on to hold the tubing up, cut the slots,little silicone, works good, real good now that I did the blowermotor upgrade. You can see in the pic the windshield gasket is cut for defroster. Hope this might help.
That is why I read as many posts as I can. I have gauge/heater duct issues and have not put the brain cells together to fix it and your solution is spot on. Thanks
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Unread 10-13-2011, 10:36 AM   #6
Pathkiller
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Quote:
Originally Posted by mulliflier View Post
I just hope the little Mojave actually puts out some heat; I think I would have gone with the Summit but I didn't live in CO back then...
The Mojave puts out 12,000 BTU and the Heatercraft/Moab sold by Summit puts out 28,000 BTU. You could probably sell your Mojave to someone in a warmer state and recoup some of your investment and then buy the Moab heater.
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Unread 10-15-2011, 02:51 AM   #7
Fins
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Yep, the heater craft puts out more but if your duct work is the original oval stuff you'll still be using a squeegee on the inside of the windshield in wet weather.
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Unread 10-26-2011, 10:50 PM   #8
Chewtoy
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The heater craft works great for me. I bought the one that comes with the extra plenum box and vents. Off the main heater core one hose goes to the standard plastic defrost duct and the other hose goes to the vent plenum. I get a little fog on the passenger side, but for the most part my windshield stays clear. I do have to turn it down sometimes or it gets too hot.
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Unread 10-10-2013, 02:40 PM   #9
ReDinTX
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Quote:
Originally Posted by Fins View Post
Yep, the heater craft puts out more but if your duct work is the original oval stuff you'll still be using a squeegee on the inside of the windshield in wet weather.
why?
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Unread 10-12-2013, 09:46 AM   #10
John Strenk
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Well I do know that if the lower drain in the heater box gets plugged, you will be spraying water through the heating system.

There are two water/rain drains in the heating system, one in the plenum and one in the heater box.
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