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What is the reason for one fan not spinning in a Volkswagen?

2 Answers

SanBrooklyn

07/24/25 11:06am

Volkswagen fan one turns and one does not turn for the following reasons: 1. Whether the water temperature meets the requirements: Nowadays, most car radiator fans operate electronically with temperature control, so generally, the fan will start spinning normally only when the car's internal water temperature reaches the required temperature. If the temperature is too low, the radiator fan cannot spin. 2. Relay failure: If the water temperature meets the requirements but the car radiator fan still does not work, it could be an issue with the fan's relay. If the relay fails, the car's radiator fan cannot operate. 3. Problems with the temperature control switch: Sometimes, faults can occur in this area, which can also affect the operation of the car radiator fan. Therefore, it is also important to check this part.

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EstherRose

08/11/25 6:03am

Recently, I also encountered a situation where one of the Volkswagen cooling fans wasn't working, so I specifically consulted a master technician. He said there are usually three most common reasons: first, the fan motor might be burnt out, possibly due to water ingress causing a short circuit in the coil or severe wear of the carbon brushes; second, there could be an issue with the wiring, such as a blown fuse or a loose plug causing poor contact; third, the fan relay might be faulty, preventing the control signal from being transmitted. A jammed fan is relatively rare, but it's still necessary to check if any foreign objects are obstructing the blades. He suggested first checking the fuse box and then measuring whether the motor's resistance value is normal. In the end, I found out it was a blown fuse, and replacing it myself solved the problem. With a dual-fan system, if one fan isn't working, the engine temperature can rise quickly when using the air conditioning in summer, so it's safer to check and fix it promptly.

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