I was on a trip in July and about halfway through the trip the coolant level low light came on. I filled it back up and thought nothing of it. My car had almost 100,000 miles on it at that time. Since then the coolant level hasn"t dropped enough to trigger the sensor. Is that normal to have a loss in fluid like that? I never smell any radiator fluid and I have no leaks that I can see. I'm slightly worried now because I just read a post that talked about hesitation that was caused by coolant leaking into the transmission because of a bad radiator. I have that same hesitation but am having a hard time diagnosing it because I think I have a catalytic converter problem.