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The traditional thermostat has a bulb full of wax that expands as the engine warms up and opens at a given temperature threshold, opposing the force of a large strong spring. The one for my Sentra was $18 from a Nissan dealership.
Maybe if it wasn't on your dime, it wasn't done.
In 45 years working on cars, I have never seen an engine that would not warmup that was not fixed with a properly operating thermostat.
Without properly warming up your cars engine will suffer long term term damage from the effects of running too cold, to say nothing about the significant loss in mileage.
regards
mech
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