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The cooling fan is not on all the time. When driving above 35 mph, ram air takes effect and the air going through the radiator is stronger than the air can be pulled by the fan.
When first starting the car, it may take several minutes for the fan to come on because the engine is "warming up".

The cooling fan is controlled by a thermostat. It is supposed to come on at a certain temperature. This often when the car is standing still in heavy traffic on a hot day. This causes the engine to get hotter than normal and the fan will switch on.

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14y ago
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Q: Why wont 1998 Honda civic ex cooling fan come on when car is on?
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