Does the Fan Run When the Car is Idling in Place?

1 Answers
Catherine
07/30/25 3:14am
The fan will start running after the car idles in place for about 10 minutes, depending on how quickly the water temperature rises. The time varies for different cars under various conditions. In summer, the time is shorter; in winter, it takes longer. If the car is moving, the time will also be shorter. Idling in place can have certain effects on the car. Prolonged idling can increase fuel consumption, and since the engine does not burn fuel completely during idling, it produces more carbon deposits, accelerating engine aging. During idling, the engine oil pressure is relatively low, worsening lubrication conditions. Unburned fuel washes the cylinder walls, the intake vortex is weak, and fuel combustion is incomplete, making it easier for carbon deposits to form. When carbon deposits accumulate to a certain extent, the car's power performance will decline, and over time, it can easily cause engine wear.
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