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while it opens it at a lower temp once a car is overheating it is past the temp of the stock thermostat and if the thermostat is good then it is open and you are getting the maximum circulation. I don't know how many miles your car has on it but if you have a higher number of miles and it is still running the original thermostat it came out of the factory with it could be starting to stick a little and if you are worried about it then you could replace it with the stock size while you have it apart to prevent having to do it in the future.
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