since 2 years , my car is heating up a little bit later than my friends cars , and cools down to 50C on lift-off at downhill driving. So today i checked out my thermostat and found this:


You can see there is a slightly gap between thermostat and sit. First of all i think , its ok . can buy a new thermostat . But after i get it to home , i tried to figure out why it stuck on there , and boiled it up . Thermostat is working well , opens when i heat it up no problem . Still i wonder why it is stuck in there .
After that , when i playing with it , i found that turning lower part of thermostat when holding the thread on front it moves. So i moved the plastic thing to where it belongs , and heated it up again. Works well as before .
But i wonder why this is happened? bad installation or what is it ?
And also can this cause a problem ?

You can see the thread on first picture is shorter when compered to this picture.
Testing.
is this gap OK ?


thank you folks.
