I have a 2003 hyundai tiburon 4cyl. And not to long ago the engine shut off while I was driving it. I took it to a mechanic and he couldnt find anything wrong with it. So I kept driving it. After about 2 months of no problems I drove it about 30 minutes and stopped to get gas. Once I went to turn the car back on it wouldnt turn over. I waited for about 20min then it started up again and drove fine for another 30minutes. I was scared to drive it but had no choice. I just replaced the thermostat, and now it will turn over after driving it a while. I was wondering if my temp gauge is getting stuck alittle bit less than halfway cause it never goes passed that. It will work normally untill it reaches that point then never goes passed that. Or can this mean my car was just never overheating?