98 wrangler, 4.0, 5 speed, with warm not hot heat. blend door and inside controls all work properly. I flushed the heater core, and hoses, wasn't too bad, a little brown water came out. Next replaced the thermostat with a new 195. Still little heat. Replaced the thermostat with a boiled thermostat that opened, I even boiled the old thermostat, and it opened also. I replaced the radiator cap, and waterpump with the same reverse flow type water pump. Still low heat. I do notice that when the jeep is warm (thermostat open), I see no flow of antifreeze flowing in the top of the radiator, and the bottom of the radiator is cold, and so is the bottom radiator hose. Both heater core hoses are warm, and the upper hose is warm. The Jeep is not overheating and the gauge says just below 200 when it is warmed up. I bought a new radiator and will put that in as a last resort. Any other thoughts on what the problem could be? Thanks for any information.