What is the reason for the electric fan not working in the new Jetta?
3 Answers
Jetta car fan not working is caused by: a faulty relay in the car's fan system. Additional information: 1. Introduction to the Jetta car fan not working: Whether the car's cooling fan starts to rotate depends on the coolant temperature, not time. When the coolant temperature reaches 98°C, the radiator fan will automatically turn on. The car radiator fan turns on automatically and cannot be manually controlled; it does not start at low temperatures and operates at two speed levels for medium and high temperatures. 2. Medium and high settings: Generally, the medium setting automatically activates at 95°C, and the high setting at 105°C. Only after the engine has been running for a certain period and the temperature rises will the coolant temperature in the radiator also increase.
Oh dear, my new Jetta's electric fan stopped working before and gave me headaches for days. Mainly need to check three areas: First feel the fuses, especially the one labeled 'fan' in the engine compartment fuse box - if it's blown, just replace it with one of the same amperage. Then try unplugging and replugging the coolant temperature sensor connector - sometimes poor contact or a faulty sensor means the fan doesn't receive the start signal and just quits. Finally, have family help turn on the AC - if the compressor runs but the fan doesn't move, nine times out of ten it's the fan motor or brushes that are bad. Once a mechanic took it apart and showed me - it was so clogged with dust the blades got stuck. If you can't fix it yourself, better find a professional quickly - without the fan, the engine will boil over like water!
A non-functioning electric fan can be more complicated than imagined. Beyond basic issues like blown fuses or motor failure, consider whether the coolant temperature sensor is sending incorrect signals. I've encountered a case where pitting and poor contact in the fan relay contacts caused intermittent operation - multimeter testing showed on-and-off connectivity. Nowadays, many vehicles integrate the fan control module into the ECU, meaning engine computer issues can affect fan operation too. For daily drivers frequently operating at low speeds, radiator fins clogged with insect remains or willow catkins can overload the fan. If you notice abnormal fan behavior, immediately reading trouble codes can save significant diagnostic time.
