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Why does the fan keep running when the water temperature is not high?

2 Answers

LeoLynn

09/08/25 6:32am

There are several reasons why the car fan keeps running continuously even when the water temperature is not high. Common causes include failure of electronic components in the cooling system (such as the thermostat or cooling fan), poor radiator performance, or insufficient coolant. Here's how to handle this situation: 1. Pull over to the side of the road, but do not turn off the engine immediately. Since the coolant temperature is already very high and its cooling capacity has reached its limit, turning off the engine right away would stop the circulation of the boiling coolant. 2. Let the engine idle for a while. The continuously circulating coolant can help mitigate the impact of high temperatures on the engine. 3. Check if there is a shortage of antifreeze and inspect the circulation of the coolant to see if it is not flowing properly.

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LeCecilia

09/20/25 5:04am

I just fixed this issue where the fan keeps running even though the coolant temperature isn't high. This is usually caused by a stuck or faulty thermostat switch. The thermostat switch's function is to activate the fan when the coolant reaches a high temperature point and turn it off when the temperature is normal. If it remains stuck in the 'on' position, the fan won't stop. Another possibility is an erroneous signal from the coolant temperature sensor, such as when the sensor port is clogged or the connector is oxidized, sending incorrect data to the ECU and causing continuous fan operation. Sometimes, the fan relay can also malfunction, with its contacts sticking together as if jammed. You can perform some basic checks yourself: inspect whether the fan fuse in the fuse box has blown, or wait a few minutes after turning off the engine—the fan should automatically stop shortly after shutdown. If it doesn't, there's definitely an issue. Never ignore this, as constant fan operation drains the battery significantly; prolonged parking may leave the battery too weak to start the car the next day. Worse yet, continuous operation could overheat and burn out the fan motor itself, leading to costly replacements. In such cases, I recommend driving to a repair shop as soon as possible for professional diagnostic equipment testing—don't delay.

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