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2004 Kia sedona summer overheating

Nightflyr *
Richard Kirshy

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.