I have a 95 3.8L right now, I replaced the head gaskets a year ago (approx-8,000) and I am having heating problems again. I had the same symptoms as before I blew them the first time so I automatically thought I blew them again. So, I just re-did the heads again. 3 days later I am having heating troubles. The gauge shows that the temperature is all over the place. It will heat up real fast almost overheating then it will cool down and will do that about 8 times before it will stay at a constant temp. This is all while I am driving, when I am stopped at a light it cools down. I have replaced the water pump, radiator, hoses and thermostat in the last year and now I have no idea what could be causing this. Please help!