where's your temps at?

[Jean-François Roldan]

About the temp,
 
mine is running normally at about a quarter of the way up when driving. If I stop and let it idle for more than 2-3 minutes, the temp then goes up half way quite fast and then the fan kicks in and it stays about the same until I start to drive again, then it goes down eventually to the point of where it was before stopping.
 
Shouldn't the temp stay the same all the time once it gets to running temp? Could it be a bad coolant temp sensor? could that sensor make the car not start or die if it thinks it is too hot? 
 
thanks
 
JF
 
 
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