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Heater Core Ill

Discussion in '40- & 55-Series Tech' started by mattcobb, Nov 18, 2003.

  1. mattcobb

    mattcobb

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    the heater core in my 74 fj40 gets super hot (sounds right) on the bottome for the lower vents but the top of the core never gets hot - I can place my hand right on it. It there and air bubble or some junk stuck? New cruiser to me so I do not know how long it has been like this. Any ideas on diagnostics / solutions? I was going to isolate the core and use radiator flush on it / maybe take a hose and flood it out. Any other thoughts / plans? Thanks
     
  2. Archengine

    Archengine

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    Just what you said. Sounds right, if it doesn't work, repost, and well try something else.
     
  3. Degnol

    Degnol

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    With the exception of leaks, EVERY problem I've ever had with heatercores not working properly has been DIRT, either scale, rust and crap inside, or dog hair, cottonwood seeds, leaves in the fins on the outside. The "bubbles" tend to work themselves out with repeated warming and coolong cycles.
    Degnol :)
     
  4. Paul_A

    Paul_A

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    I believe that the upper vents only blow fresh air and heat is only supposed to come out the bottom (heater) and defroster....or a I all cold on this?
     
  5. Degnol

    Degnol

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    Paul is right, the air, either recirculated or fresh comes in the side of the top of the box and the heatercore is about halfway down and horizontal, so only hot on the bottom half of box. If blowing hot there I wouldn't do anything.
    READ the post, Ed :doh
    GL
    Ed Long
     
  6. 1Fine40

    1Fine40 Rust Buster SILVER Star

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  7. mattcobb

    mattcobb

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    Ok then - as usual - thanks agin to all. The mighty 74 is not as ill as I thought with cool air only blowing out of the top and hot out of the bottom. With that said - is there an aftermarket core that will heat on both top and bottom? Just though I'd ask. Aloha
     
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