2004 Kia sedona summer overheating

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1 week 2 days ago #203854 by spankashmoop
2004 Kia sedona summer overheating was created by spankashmoop
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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1 week 2 days ago #203855 by relative4
Replied by relative4 on topic 2004 Kia sedona summer overheating
If you've made sure the fan is running, then I would hook up the rear heater core.

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1 week 2 days ago #203858 by nightflyr
Replied by nightflyr on topic 2004 Kia sedona summer overheating
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.

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1 week 22 hours ago #203869 by spankashmoop
Replied by spankashmoop on topic 2004 Kia sedona summer overheating
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.

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1 week 20 hours ago #203870 by nightflyr
Replied by nightflyr on topic 2004 Kia sedona summer overheating
Could try a chemical flush.
You can google " How to clear a engine block coolant blockage "

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1 week 15 hours ago #203872 by spankashmoop
Replied by spankashmoop on topic 2004 Kia sedona summer overheating
Great thanks, Once I get some decent weather ill check that stuff out.

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