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You can remove it and place it in a pan of hot water and see if it opens at the proper temperture, but why do that. Once you have it out, just replace it with a new one and you know it is good then. An 15 year old thermostat is more than likely bad. Considering you have to drain the radiator to a low level to remove the thermostat, do a complete cooling system service at this time.

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Q: How do you tell if the thermostat is bad on a 1991 Plymouth Grand Voyager?
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