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Thread: Defrost and anti fogging help/advice

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  1. #1

    Default Defrost and anti fogging help/advice

    Well after three years took out my 68 in the first winter storm.

    I have the fuel fired heater inside and it's toasty but the defrost is simply routed up a hose near the windshield but there is not a plenum or duct to force it to blow on the windshield to actually defrost etc.

    Was there ever a duct plenum in these?

    If not the only other thing I can think of would be a fan like in a school bus?

    Sent from my SM-G900V using Tapatalk

  2. #2
    Join Date
    Sep 2014
    Location
    Wichita Falls, TX
    Posts
    603

    Default

    There is a plenum. Not that it works that great, in mine anyway. I haven't seen the plenums for sale anywhere but haven't looked either.

    I might try the fan thing in mine.

  3. #3
    Join Date
    Jul 2009
    Location
    Louisville, KY
    Posts
    1,041

    Default



    Is this the plenum? You can see the two ducts on the top that connect to the defrosters.
    Thanks for all the help!

  4. #4
    Join Date
    Jul 2009
    Location
    Louisville, KY
    Posts
    1,041

    Default



    Here it is before I installed it in the truck. You can barely see the defroster vents in front of the plenum.
    Thanks for all the help!

  5. #5

    Default

    The defrost vents in front of the plenum looks like they're the right shape. As part of the fuel fired heater there is already the plenum/splitter with two hoses that come up towards the windshield but I am missing the defrost vents that direct it right on the windshield

    Sent from my SM-G900V using Tapatalk

  6. #6
    Join Date
    Sep 2008
    Location
    Stevens Pointski, Wisconsin
    Posts
    1,350

    Default

    Defroster vents are made from unobtanium.

    Scott
    '67 M715 '67 M725 '69 M726 (x2)

    "it's cheap and you get all you can shove in your pie-hole" --Kozmo 12-10-13

  7. #7

    Default

    Quote Originally Posted by fishtail View Post
    Defroster vents are made from unobtanium.

    Scott
    Quite true.

    I made a set for mine, by modifying a pair of shop vac nozzles. Worked great.
    I wish the heck that I would have taken pictures while doing it, as it would have made a great tutorial.

    I'm kind of wondering if plastic nozzles (NOS or homemade) would hold up to a gasoline heater.

  8. #8
    Join Date
    Dec 2003
    Location
    Giddings, Texas
    Posts
    7,728

    Default

    The proper M715 defrost nozzles do work great. But, as pointed out they are hard to find these days.

    Many have had success with the vacuum made nozzle trick.

    If you have a heat source and some kind of nozzle at the windshield along with a good windshield to cowl gasket. The windshield will stay clean inside and out. A few years ago Colton and I drove the M715 in freezing rain and ice for 80 miles or so. With the fan on hi, we had great forward visibility while the rest of the truck including the side windows had a pretty thick layer of ice on it. Coolant heater with a 195° thermostat on the engine.
    Remember if you didn't build it you can't call it yours.

    6.2 powered M715, 5 M1009's, M416, 2 M101's, 2 M105's, 3 M35's, M1007 6.5 turbo Suburban project called Cowdog.

    https://www.youtube.com/channel/UCCz...HGkBCfhXZ5iuaw

  9. #9

    Default

    We used the defroster fittings from the J20 we salvaged the heater unit from. Not a perfect fit, but they did actually bolt onto the stock studs. The driver side one almost completely obstructs the area formerly occupied by the military headlight switch, however.

    I haven't tested this arrangement yet, because the roads are covered in salt residue, and I need to install heater hoses & a thermostat.

  10. #10

    Default

    Well we have a few options here gentlemen.

    I found these from maradyne.
    http://maradynemobile.com/product/2454-1/

    There is also the option of some one who has the proper M715 defrost nozzles to take good pictures and measures for me to reproduce them on my 3D printer, or someone could loan me a set and I could reverse engineer them and 3D print some replicas for all to try at cost. I would be willing to absorb the engineering R&D cost if someone could provide them.

    Sent from my SM-G900V using Tapatalk

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