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If it is like the 95 3.1 you more than likely you will have 2 air bleed valves, one on the thermostat housing and one on the thermostat bypass (i think). If I am not mistaken these need to be open while filling the system (close them if/when coolant start flowing out of the valve). You also want to make sure that these valves are fully closed once system is filled. Also, if you haven't already you might consider a new radiator cap.