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Why is the car cooling fan not working?

2 Answers

Patel

07/29/25 2:18am

The reasons why the car cooling fan is not working: the water temperature does not meet the requirements, or the relay is faulty. Water temperature does not meet the requirements: Most car radiator fans nowadays operate with electronic temperature control, so the fan will only start rotating normally when the water temperature inside the car reaches the required level. If the temperature is too low, the radiator fan will not turn. Relay failure: If the water temperature meets the requirements but the car radiator fan still does not work, it could be due to a problem with the fan's relay. If the relay is faulty, the car's radiator fan will also fail to operate.

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VanBenjamin

08/12/25 6:18am

I've seen this issue of car cooling fans not spinning many times, and experienced long-distance drivers know a thing or two about it. Simply put, the cause could be a blown fuse—open the car's fuse box, locate the fan-related fuse, check for any signs of melting, and try replacing it. If the fan motor's bearings are seized or the coils are burnt, the blades won't turn; if you feel resistance when manually spinning the fan blades, the motor might be faulty. The relay is also crucial—it controls the current flow, and oxidized contacts or a faulty coil can prevent the fan from receiving power; try swapping in a known-good relay to test. Another possibility is a faulty temperature switch, which senses coolant temperature and signals the fan to start; if the fan doesn't engage when the engine is hot, this switch needs checking. Wiring issues like harness wear or loose connectors can also interrupt the current. A non-spinning fan leads to rapid coolant temperature spikes, risking engine overheating and severe damage—it's best to stop and inspect or visit a repair shop immediately rather than pushing on. Older cars with aging electronics are more prone to such failures, so during routine maintenance, always ask the technician to inspect the cooling fan system.

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