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Replacement,universal,heater Box And Fan?

Discussion in 'Jeep Truck and FC Tech' started by 70cj5134f, May 3, 2020.

  1. May 3, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
    Aug 18, 2018
    Messages:
    736
    My 82 j10, has a Giant heater box and fan on the pas side under hood.
    Headers and plug change and VC removal are $%&#÷.
    Would like to rip it all out and replace with (?), maby a universal from summit, or
    A junk yard one.
    Anyone done this. On a full size jeep?
     
  2. May 3, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    2,734
    Are you talking about an A/C evaporator box? or is it strictly a heater box?
    -Donny
     
  3. May 4, 2020
    timgr

    timgr Eppur si muove. 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Aug 10, 2003
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    The heater box gets in the way of many engine swaps too. You can buy units like this one GEN IV MAGNUM Universal Fit Systems - Vintage Air that include heat and AC. This one is said to fit under the dash well. Search for AC conversion on ifsja.org or fsjnetwork.com
     
  4. May 7, 2020
    70cj5134f

    70cj5134f Member

    East Tn
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    Aug 18, 2018
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    Yes, it had factory AC. I won't. Can I just remove the under hood part, and fab a cover
    And still use the heat part?
    Thanks
     
  5. May 7, 2020
    timgr

    timgr Eppur si muove. 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    The heater core is in the box under the hood. Realize that the FSJ engine compartment was designed for the 230 cid OHC six, and V8s don't fit very well. There's miles of room between the heater box and the engine with an inline 6. The AC is completely separate from the heater and under the dash. They don't share anything - not blowers, not ducting, not controls, nothing.

    Heater: J10HeaterBox.jpg

    The wires going into the heater box are for the blower motor speed reduction resistor. The heat from the resistor goes into the heated air for the cabin. I thought that wuz kind of neat. I expect today they instead make multi-speed motors with boost and buck field windings, like the 2-speed wiper motor. Or an external chopper with an SCR - some kind of PWM speed control that makes less heat than a resistor. This would make sense when the heat and AC share ducting.
     
    Last edited: May 7, 2020
  6. May 7, 2020
    timgr

    timgr Eppur si muove. 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    You won't what? :confused: Use the AC?

    You could remove the AC and fit a Mojave heater, like used in a CJ. Then you could remove the under-hood box.
     
    Last edited: May 7, 2020
  7. May 8, 2020
    70cj5134f

    70cj5134f Member

    East Tn
    Joined:
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    All AC parts gone, even the under dash vents. It ant worth it in a farm truck.
    What is a Mojave heater?
     
  8. May 8, 2020
    timgr

    timgr Eppur si muove. 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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  9. May 8, 2020
    Ol Fogie

    Ol Fogie 74 cj5 304, 1943 mb 2020 Sponsor

    Jasper Georgia
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    Several years ago I owned a pickup truck with a blower motor speed reduction resistor in the heater box. leaves, trash, ect had unknowingly built up in there and suddenly caught fire. There was smoke pouring into the cab from the dash vents, 10 seconds later fire and flames were coming out. WTH :shock:. My wife grabbed her purse and bailed out :censored: as I pulled off the road. lucky we were right in front of someones house, there was a garden hose close by. We sprayed water in the dash vents and extinguished it. We saved the truck but the heater box was toast.
     
    Fireball likes this.
  10. May 9, 2020
    70cj5134f

    70cj5134f Member

    East Tn
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    Aug 18, 2018
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    When the engine comes out, I'll mess with it and decide.
    Those summit heaters look nice!
    They do go inside the cab, right? Then hoses through firewall?
    And I could still hook up defrost function?
     
  11. May 9, 2020
    timgr

    timgr Eppur si muove. 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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