Seat Leon Overheating Issue

I own a Seat Leon as well, though I am no expert mechanic. I experienced similar symptoms recently: the engine overheating, and the check engine light illuminated. I also noticed unusual fan noise. Have you inspected the thermal switch? That could be a potential cause. It is also worth checking if the fan blade is physically obstructed, or damaged.

Thank you for your insights. I am not very familiar with car mechanics. Where is the thermal switch located, and how can I check the speed sensor? I want to make sure before visiting a workshop.

In my case, the problem was a faulty speed sensor. This component relays information to the ECU, which in turn manages the radiator fan operation. When the sensor fails, the fan might not activate when it should, leading to overheating. I would recommend taking your vehicle to a trusted workshop for a diagnosis to confirm the speed sensor is the issue.

I appreciate your assistance. It turned out to be a defective speed sensor, as you suggested. The repair cost me around 250€. The radiator fan is working correctly now, and the car is no longer overheating. Thank you again for your help!