Happened to me, right after I bought mine. I got a new one and put it on. I would have probably done differantly, had I been a member of this forum at the time, I probably would have gone after market. I know that this is probably no help to you, except to let you know that there are people here that can explain things (that have already been there and done that) that will help you save money and labour in the end. Before I got into JEEPS, My neighbor who was a Jeeper, was having the same problem, and we put a thermometer in the neck of the raditator and checked the readings of the gauge. (and made sure we burped the radiator).