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My 2004 Dodge Dakota heater & defrost air comes

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Sounds like a heater core problem. Your heater blower is behind the heater core. If it is leaking, you will be blowing engine coolant vapors onto your window. Good luck

Posted on Jan 01, 2013

  • 7 more comments 
  • turner_antho
    turner_antho Jan 03, 2013

    New heater core installed last year.

  • jamiem1416
    jamiem1416 Jan 04, 2013

    Could be the hoses attatched to the heater core leaking. Has your coolant level gone down? Is the fog hard to clean off windows? Do you smell a sweet odor when truck is hot? Do you ever hear a gargling sound when you shut truck off? /Do you get any leaking onto the floof of the truck? Sometimes a heater core can get clogged up if the cooling system is corroded, but my guess is still problems at the heater core just because of the windows fogging up.Hope this info helps youcore

  • turner_antho
    turner_antho Jan 04, 2013

    Checked coolant level,its OK.Put in new heater core approximately 1 yr ago. Also windows foggy just sitting. Cold outside now.

  • jamiem1416
    jamiem1416 Jan 04, 2013

    I have a half ton truck GMC that was doing the exact samr thing. My heater core was leaking. It also would fog the windows up even sitting on a nicr day. It's not too much work to check the core. If you can get to it and feel around for leaks by hand , this could help. I have had heater cores go bad within a year. Also, you say it's cold and the windows are fogged up? Go see if you can wipe it off, or if it's frosted. Antifreeze doesn't freeze. It might answer a question. Let me know, and in the mean time, I will run this by a friend of mine who is a pro

  • turner_antho
    turner_antho Jan 04, 2013

    Thanks.Let me know what the pro says.

  • jamiem1416
    jamiem1416 Jan 04, 2013

    I checked with the pro. He said it's either a hairline crack in the heater core, allowing steam to escape, a heater hose near the heater core leaking, OR a cracked heater box under the hood where the heater fan is, allowing rain water to get in the system. It wouldn't be a big crack because if it was big, you would not get the heat blowing or it would be weak, as this is a sealed system He suggests getting a pressure test on the radiator. It should hold 14psi This would also show any weak hoses, or rad, but I personally say heater core . Hope it's helpful, but I went over pretty much everything it could be , keep me informed any weak areas

  • turner_antho
    turner_antho Jan 04, 2013

    One thing I forgot to mention , noticed that AC cuts on and off while heat or defog are turned on. Temperature control on hot position. Maybe a bad AC control relay?

  • jamiem1416
    jamiem1416 Jan 04, 2013

    Well, that changes things too. Vital info lol. I'll get back to you

  • turner_antho
    turner_antho Jan 04, 2013

    Getting old and forgetful.



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