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Car engine temp's increase at idle primarily because there is little or no air flowing through the radiator coils to cool the engine coolant. This is partly because the car is not moving, and partly because the cooling fan usually will not activate until a certain temperature is reached.

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19y ago

If its a Ford-The IAC motor is Dirty & can B Cleaned.

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Q: What makes the engine idle speed go up and down when cold?
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