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A radiator is a heat transfer device that allows air to pass freely over fines that conduct heat from liquid circulated within an engine to cool it.

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Can radiator cool down a car too much?

If the thermostat is operating properly the radiator will only come into play when the thermostat opens, when the engine is at normal operating temperature (around 190 degrees, give or take). … Adding a gigantic radiator won't make a bit of difference because if the engine gets too cold, the thermostat will close, causing the engine to heat up again. …
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