I just bought this car used.. it's been running rough a little bit after driving a couple hours. The coolant temp gets upto 215 F at times. And will drop to 186 but then go back to 208 to 215. When it is up around 208 to 210 it will start having noticeable shakes hiccups misfires whatever it is. I've taken it to dealer but no check engine light so they say nothing they can do. This car has 33,000 miles and is under warranty. What do I do? Anyone know possibly ehats going on please let me know. When car is between 186f and 195f it runs excellent. The fan does come on but shuts off alot even at 208+ farenheit. I feel it shouldnt be shutting off at that temp. The air coming from it at those higher temps is very hot and I swear you could bake a cake with it.