Hi Jim:

I know it has been discussed million times, but just to clarify, how do you define a bad thermostat?

My car (140) stay at 70+ degrees even after 15 minutes driving at temperature of approxmately 18-20 degrees. Is this normal? The 15 minutes driving is mostly down-hill with average rev. of 1500 - 2000 rpm.

I am not sure if there are anything wrong with my thermostat as I have replaced it 2 years ago or 15000 km ago. My car does gets to 90-95 degrees but this is after longer driving and more up-hill.

My question is, should I worry being 70 degrees most of the time and taking so long to warm up? or is it an almost replacement time?