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Which way the coolant flows in the heater core?

Discussion in 'Stock 1995 - 2001 Explorers' started by 1998Exp, October 10, 2019.

^^Searches ExplorerForum.com^^





  1. 1998Exp

    1998Exp Well-Known Member

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    My good luck of not getting stranded with my Ex in almost 20 years finally ran out - and in a not-so-convenient place to boot. A nipple sheared clean off the plastic heater valve, and it lost all coolant on a remote forest road. Overconfidence in the Ex made me travel with no tools and no water, but luckily there was cell reception there, so just a couple hours later the AAA-dispatched tow truck showed up. Using his pair of pliers we removed the offender, plugged the water hose directly into the heater core nipple, filled the radiator (with tap water, but what the heck...), and I was on my happy way back.
    So here is where I need your help: the valve has an arrow, pointing (one would think) in the direction of the flow. I assumed that it should point towards the heater core, but my visual memory tells me it was the other way round. It's installed on the outboard hose, so if that direction is correct, this would be the return hose and the valve turns off the return flow. Strange... Can anyone do me a favor, pop the hood and take a look? Much appreciated!
     
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  3. donalds

    donalds Elite Explorer

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    Yes when my wife gets out of work
     
  4. donalds

    donalds Elite Explorer

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    Best pic I can get

    20191011_051802_kindlephoto-125689129.jpg
     
  5. 1998Exp

    1998Exp Well-Known Member

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    Thanks a lot donalds! The site was down, so only seeing your response now.
    The direction your photo is showing makes a lot of sense, because that's the inlet to the HC, and the arrow points to it if mounted that way. Found out that mine was installed backwards. I never touched it, and doubt that the PO did, because it was less than 2 years old when I bought the vehicle. Most likely that's how it came out of the factory -- I have seen stranger things than that in the land of "Quality is Job 1".
    Probably either did not stop the flow completely when it should have, or made a restriction when it was supposed to be fully open. I live in a mild climate, so never noticed a problem -- until the thing broke, but that's almost certainly just age related.
     
  6. donalds

    donalds Elite Explorer

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    No problem:dpchug:
     

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