Why does the Jetta fan keep running?

1 Answers
OColeman
07/30/25 9:31am
Jetta fan keeps running due to excessively high engine coolant temperature or a short circuit in the fan circuit. Here are the specific details about automotive cooling fans: 1. Automatic activation conditions: The radiator fan automatically activates when coolant temperature reaches 98°C. The car's radiator fan operates automatically without manual control, doesn't start at low temperatures, and has two speed gears for medium and high temperatures. 2. Medium/high fan speeds: Typically activates medium speed at 95°C and high speed at 105°C. When coolant reaches 95°C, the fan starts running at 1600 RPM, and when temperature reaches 105°C, the fan speed increases to approximately 2400 RPM to enhance cooling efficiency.
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