I've had the same problem in hte past on a 2.5 equiped jeep. Mine was the temp sensor. Not that this is yoru problem, but it would seem that if the problem came up and then corrected itself while continuing to drive, that 1 of 2 things is happeneing. either the sensor is messing up, or you have air pockets from low coolant level. if you are sure the coolant level is good, i owuld opt fo the sensor, usually a fast easy fix and a cheap part from a local auto parts store. just pull the wire/plug off the old sensor, unscrew it(you will lose a litle fluid here, just have the new one ready), quickly insert the new one, screw it in and reconnect the wire. Just my 2 cnets, hope it helps
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