What are the reasons why the fan cannot rotate normally when idling?
3 Answers
The reasons why the fan cannot rotate normally when idling include: the car's water temperature not meeting the requirements, relay failure, or issues with the temperature control switch. Below are the specific details: Car's water temperature not meeting the requirements: Most car radiator fans operate based on electronic temperature control. The fan will only rotate normally when the car's internal water temperature reaches the required level. If the temperature is too low, the radiator fan will not rotate. If the car radiator fan fails to rotate, the first step is to check whether the water temperature meets the requirements. If the water temperature cannot rise, the car engine needs to be inspected. Relay failure: If the water temperature meets the requirements but the car radiator fan still does not work, the issue might be with the fan's relay. In this case, the damaged relay needs to be replaced. Issues with the temperature control switch: A faulty temperature control switch can also affect the operation of the car radiator fan. Therefore, it is important to inspect and replace any damaged temperature control switches.
Recently, my car's fan doesn't spin when starting in place, and I'm trying to figure out what's wrong. Most of the time, it's due to the aging of the fan motor itself or severe wear of the carbon brushes, which prevents the current from passing through and stops it from spinning. Blown fuses are also common—it's a circuit protection feature, so checking the fuse box in the engine bay is the most straightforward approach. Another possibility is a stuck relay, which controls the fan switch; poor contact can cause it to fail. Don't overlook wiring issues, such as loose plugs or aging wire harnesses causing short circuits, which can affect power supply. A faulty temperature sensor might prevent the fan from spinning when it should, easily leading to engine overheating. This situation is quite dangerous—if discovered, it's best not to idle for too long and to seek a professional repair shop for testing. Regular attention to the vehicle's cooling system maintenance can help prevent such troubles.
When the fan doesn't spin after the car starts, it's natural to panic, fearing engine damage. The first thing to check is the fuse, which may blow due to excessive current, indicating the protective function is working. Fan motor failure is common, often due to internal wear or seized bearings. The relay might be faulty, as it's responsible for powering the fan. Wiring issues like corrosion or loose connections can easily interrupt signals. If the temperature sensor malfunctions, the fan won't start automatically. Untreated, these issues can lead to overheating, compromising driving safety. If this happens, stop driving immediately and seek repairs promptly. I recommend regular checks of cooling components to extend their lifespan.
