Like others have said before it could be a bad stat. BUT even though you had the system flushed on a truck that old myself i am leading to to the heater core being pluged . With the honey comb design they do not flush out like you think they do . So unless you reverse flush them they just plug tighter. and if it is plugged tight enough she will not unplug. BTDT . Now not being and expert on the Dakota just yet as i am still looking for one for myself . I am not sure if the heater core is a free flow or if it has a valve to shut off the water flow or just uses a door in the heater box to flow air past or thru the core . IF it has a valve your would not be the first to go bad and not open with the control cable . And if it uses a door in the box to control the air flow then here again are you sure that the door is opening and closing . You can reverse flush it yourself by removing the two hoses and the hose that comes off the highest point BEFORE THE STAt is the hot water hose and the one that goes into a fitting closest to the water pump is the return . So hook up to the one that is the return with a garden hose to hot water if ya can and run the water back thru it that way and see all the junk that will come out the other hose . IF you only have a trickle or no flow then , yep it is time for a new core. Now if it does clear out ya may get by for a while BUT The down side of all that junk plugging the core in one spot has rotted it on the inside and yep she will start to leak at some pointBTDT also . As to how hard it is to replace the core , don't know the easiest core i ever replaced was on my 88 Ford F 350 as all ya had to do was drop the glovebox remove a few screws and take the hoses off and in 30 min. and two beers it was done .
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