There is a small coolant hose that goes from the center pipe to the sensor pad makes a 180* bend check that one out. Could be headgasket but the 3.0 was more likely to blow into to the cyl. 3.4 was bad about leaking to the out side. Thers also some small freeze plugs look at them good to.
that center pipe hose dried out and cracked on mine, was dumping water down the back of the engine, made it look like it was coming out of the head.
