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charleskrueger1

Seat Leon Overheating Issue

I am experiencing an issue with my 2002 Seat Leon, equipped with a diesel engine, with mileage of 167761 km. The car is overheating, and the check engine light has illuminated. I suspect the radiator fan is defective. I have not been able to identify the root cause. Does anyone have suggestions?

Summary of the thread

A 2002 Seat Leon with a diesel engine is experiencing overheating issues, accompanied by an illuminated check engine light. The initial suspicion was a defective radiator fan. Suggestions included checking the thermal switch and ensuring the fan blade is not obstructed or damaged. Ultimately, the problem was identified as a faulty speed sensor, which was replaced, resolving the overheating issue.

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4 comment(s)

richardblade1

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.

charleskrueger1 (community.author)

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.

richardblade1

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.

charleskrueger1 (community.author)

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!

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SEAT

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LEON