if you ever have coolant temps issues... always always look for leaks first... thats the number one reason a lot of issues stem from. low coolant. then start looking at other easy fixes that are most likely. t-stats depending on the car are fairly reliable. and replacing one for fun. or you think is the problem is no the best way to go about fixing somehting, even if something indicates that it might be a t-stat... its called di-ag.....