Hey Willy

I am having the Exact same problem with a 98 Cherokee. I have flushed the core out several times and have plenty of water coming out with the pressure of a Garden Hose.
My Temp gauge reads 195 degrees and I put in a New Thermostat just to be safe. I have inspected my Radiator and it is fine, I checked the doors they open and close as they should. I felt the upper hose going into the firewall side of the core and it is HOT the bottom hose is only warm. Before I dismantale the whole dashboard to replace the core on a 98 Cherokee, I wanted to be sure that was my problem and I am NOT sure. I have taken note that the Water Pump Housing looks pretty new as compared to the rest of the engine. My thought is that the fins of the fan are NOT turning, which allows water to pass thru it from convection and is enough to keep a straight 6 on cool but not enough to give adequate pressure to speed up the flow of how water to do as KT said in his reply, pass it thr to keep it HOT long enough. My next step when we have a day above 50 degrees is to take a hose off and run the engine to see if there is any pressure at all which should fill a bucket up pretty fast. I too, am stumped.

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