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The engine temperature rises until it get so hot the internal oil burns away and then the engine locks up and stops. Then you call a wrecker and get ready to spend a lot of money or abandon the car where it sits.

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17y ago
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13y ago

Running a car with no thermostat will decrease gas mileage and pollute because the engine is not being maintained at optimum temperature. On the cars made in the last 20 years that are computerized, this can effect other system efficiency. However, if it is only temporary it will probably be unnoticed.

On some newer vehicles it will trip the check engine light.

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Q: What Happens to a car engine without any coolant?
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