im still fighting my battle with the overheating too. got a fan clutch from a 99 trooper, and put it on. blows all kinds of air now. i can see that my old one was probably bad by comparison. feels like ive lost some horsepower, it may just be me, i almost think it changed my shift points!?!

anyway, it was fine for about 2 weeks, and the overheating started again.
i am thinking pressure also. but i dont know where from.
at least now, i can go for a week or so, till it overheats. but i am low on coolant every time, and my firewall, beside the brake booster, it is covered with coolant every time it overheats, coming from the resivour.