I've been meaning to take a photo of the old thermostat I replaced in the Sentra. You can see where it is stuck open. I'll bet it is the original part, 22 years old.
Thermostats that fail open make your engine run too cool. Those that stick closed can destroy your engine. I highly recommend to anyone that if you replace your Japanese car thermostat, just buy original equipment from the dealership. My replacement cost me $18.
regards
mech
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