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Thread: Heater Box outlets?

  1. #1
    Jacob's Avatar
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    Heater Box outlets?

    The heater box has four air outlets, 2 are round and 2 are oval shaped...does it matter which two are used for the heater tubing and which two are used for the defroster outlets? When looking into the box they all mix in one open area, so it would seem to not matter which outlet is used for heat or defrost...thanks!
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  2. #2

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    doesn't matter.
    Mike

  3. #3
    Jacob's Avatar
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    Quote Originally Posted by michael everson View Post
    doesn't matter.
    Mike
    thanks I assumed so
    MK IV complete Kit - 1st time builder started Sept 2016
    Levy 306
    T5
    2015 Mustang IRS
    Power steering - Levy setup, Breeze roll bars, Thompson trunk box
    fuel injection, powder coating, sway bars, heater, wipers, 17 in wheels

  4. #4
    Well Used Member boat737's Avatar
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    ...and you'll notice that the 2 inch flex hose fits over both the round or the oval. (I used all four for foot box heat.)
    Attached Images Attached Images
    Last edited by boat737; 05-19-2017 at 05:17 PM.
    If Brute Force doesn't work, you're not using enough of it.
    Basic Stuff: MK4 Complete Kit #8439, Wilwood's, 17" Halibrands. Extra Stuff: Stainless brake and fuel lines, Breeze cooling, Battery mount, SS Roll Bar. Old Fart Stuff: Heater, Seat Heaters, Footbox Fresh Air, Stereo, Keyless ignition, Power Steering, Hyd Clutch.
    Young & Dumb Stuff: 427w Dart, TKO600, 3 link Moser M9/Ford 9", 3.5:1, Eaton TruTrac Posi. Graduation Thread

  5. #5
    Senior Member JIMOCO's Avatar
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    I only used two and capped off the other two. On the right I used one flex tube and went directly to the heater outlet. On the left I ran one tube to the heater outlet with two PVC T's and short flex tubes to the defroster outlets. This cut down on the amount of tubing I had to deal with behind the dash and worked just as well.
    Mk4 Roadster, Picked up complete kit 8/22/14. Most FFR options except Wilwood brakes and IRS. First start 11/11/14. Go-kart 3/8/15. 347 Stroker, TKO 500, 3-link/3.27 rear. PA street legal 7/29/15.

  6. #6
    Senior Member AC Bill's Avatar
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    Just as an aside, instead of the supplied elongated outlets, I used round defog outlets that could be shut off. When they are off, it blows all the heat down into the cockpit/foot box's. It makes for far more comfortable cruising in the colder months and at night. Without a roof, I never have the windshield fogging anyway. I have used the defog outlet to warm my fingers at times..

  7. #7
    Out Drivin' Gumball's Avatar
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    I used all four - lower ones for the foot box outlets and the top two for the defroster vents.

    Example of footbox vent....



    I used some 90* PVC elbows to get the hot air to the cowl defroster vents, too - visible at the far top of this pic....

    Later,
    Chris

    "There are no more monsters to fear, and so, we have to build our own."
    Mk3.1 #7074

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