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What to Do If the Car Fan Keeps Running Without Overheating?

2 Answers

VonElizabeth

07/29/25 11:19am

The solution to the car fan running continuously without overheating is inspection and repair. Below are the relevant details: 1. Inspection and Repair: If the fan continues to run after the temperature has dropped, it indicates a fault in the cooling fan assembly or internal wiring. It is recommended to visit a professional auto repair shop for inspection and repair. 2. Causes: The temperature inside the radiator has not fully risen, as many current car models use electronically controlled thermostats for fan operation. Therefore, if the system does not detect high temperatures, it cannot activate the fan; internal relay failure, which directly affects the radiator fan's operational state; thermostat switch issues.

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Catherine

08/13/25 6:33pm

I've been driving for over twenty years and have seen plenty of cases where the fan keeps running, especially when the car isn't overheating. Usually, the issue isn't the car heating up but rather a faulty sensor or relay. For example, a broken temperature sensor might falsely signal overheating, causing the fan to run continuously, or the fan might automatically activate for cooling when the AC is on. Start simple: turn off the AC, wait a few minutes, and see if the fan stops. If it does, then the AC is the culprit. But if the fan keeps running, check the coolant level—low coolant can also trigger abnormal fan operation. Last time I encountered a similar issue, the fan ran all day, and it turned out the relay was stuck. I took it apart myself, inspected it, and replaced the relay, saving on repair costs. However, if you're not familiar with electrical systems, don't tinker recklessly to avoid short circuits or draining the battery. Instead, head to a 4S shop or professional repair station to scan for fault codes with a diagnostic tool and get it fixed promptly. In short, don't ignore it—letting the fan run constantly can drain the battery and strain the engine, turning a minor issue into a major one.

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