Just wait, it will get progressively worse. I have a 96 Lsi and had the same issues two years ago. Temp. gauge would spike all the way up and then settle down to normal, and coolant would spill out of the overflow tank. Drove the car like this for two weeks, and nothing got better. Svxfiles tried stopleak and same results. He finally gave me the cheapest Head Gasket job anywhere. Runs awesome now. Thanks again Tom K!
