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To test a thermostat, you put it in boiling water,; with a digital thermometer/ or temperature probe. Anything less than 170 farenheit, the thermostat is close, It starts to open once the coolant/water reaches 170. If not, then it's faulty.
If the vehicle had no thermostat when you took it apart, ; the temp will go higher than normal even if you put a working thermostat in.
The job of the themstat is to all the time keep the motor temp at a specific range.
One is not able understand this, untill they put a thermstat in boiling water to observe how it opens. Yes it may take some time for the water to boil in the pan on the stove.
If the home owner doesn't permit this, then get a plastic container to put the thermstat in, boil water in a pot.
Pour the hot water in the container, and the opening of the thermstat is shown.
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