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2004 Kia sedona summer overheating

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  • November 26, 2019 at 8:54 am #895345
    James KaminskyJames Kaminsky
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      Ok so I have a 2004 Kia Sedona which I love. Yes I know “love a mini van”, you mad bro!! But there is this persistent problem (Three Years Now) I can not seem to find a fix for. The Temp gauge tells me its overheating on warm days say above 80 deg. F below that all is good. I have put in a new thermostat, Radiator, fan motor(this was first as it was bad) and Water pump to no avail. It seems That it can keep its cool for maybe the first 15 minutes or so as long as it moving down the road at a good clip but as soon as I stop for a couple minutes that needle is headed north again. Usually at this point I would turn on the interior heater with the windows down to help keep it under control. Rear heater core has been blocked off. I really seems like it is unable to dump excess heat or is just running so hot the rad can not keep up. There are no coolant leaks and coolant looks good, Does not seem to be a head gasket as it surely would have failed completely by now, 40K miles like this, and no other tell tail signs of that. Below 80 or so degrees everything is great. Not sure what else could be causing this problem, was thinking about hooking rear heater core back up but I doubt that would help. Just out of ideas. Any thoughts???

      Mini Van Lover!

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    • November 26, 2019 at 10:22 am #895346
      Billy AndrewsBilly
      Participant

        If you’ve made sure the fan is running, then I would hook up the rear heater core.

        November 26, 2019 at 12:54 pm #895349
        Nightflyr *Richard Kirshy
        Participant

          First possiblity:

          But there is this persistent problem (Three Years Now)
          Rear heater core has been blocked off.

          Obvious question :
          Has the rear heater been disconnected for the same amount of time of your issue?.
          If so reconnect it.

          Second possibility:
          Considering you state you’ve replaced MOST of the components in your cooling system ( you never mentioned the cap or hoses )
          I might suggest you try the cap if you haven’t replaced it already.
          Also check for a hose(s) collapsing causing a flow restriction.

          Third possibility:
          You may have a partial coolant blockage inside the engine block.

          November 28, 2019 at 2:10 am #895360
          James KaminskyJames Kaminsky
          Participant

            Ok I can check/replace the cap and hoses easy enough but what could be done for blocked coolant passages in the engine? Also not sure if the problem started when rear heater was blocked off as it was one of the first things I did when I got the van, before I drove it on a hot day.

            November 28, 2019 at 4:35 am #895361
            Nightflyr *Richard Kirshy
            Participant

              Could try a chemical flush.
              You can google ” How to clear a engine block coolant blockage “

              November 28, 2019 at 9:10 am #895363
              James KaminskyJames Kaminsky
              Participant

                Great thanks, Once I get some decent weather ill check that stuff out.

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