RS3 Cooling System Crisis: Fan and Temp Issues

Had a similar issue with my S3 2.0T from 2013. As someone with moderate experience working on these engines, I can tell you cooling system problems need quick attention to prevent serious damage. My car showed the same symptoms, car overheating and erratic temperature readings. Initially thought it was the car radiator or thermal switch, but after taking it to the workshop, they diagnosed a faulty speed sensor that was causing incorrect readings and making the cooling fan malfunction. The repair involved: Diagnostic testing, Speed sensor replacement, System recalibration, Full cooling system check Total cost was 250 Euro including parts and labor. Since the fix, the cooling system has worked perfectly with no temperature spikes. To better assist with your specific case, could you share: Current mileage, Any modifications to the cooling system, When was the last coolant change, Are you noticing any coolant leaks, Does the radiator fan run at all These details would help determine if youre dealing with the same issue or something different in your cooling system setup.

Thanks for the feedback. After 105036 KM on the clock, I took it to a mechanic who confirmed the fan blade was damaged and the fan motor had worn bearings. The fan noise was quite noticeable when the engine cooling system activated. The diagnostic showed both the radiator fan assembly and thermal switch needed replacement. Total repair cost came to 450 Euro with parts and labor. The engine temperature is now stable and the check engine light cleared up after the fix. Worth noting that during the repair they found some minor coolant system wear that will need attention at the next service interval. The mechanic recommended keeping an eye on coolant levels as preventive maintenance.

Good to hear you got it sorted. That repair cost sounds about right for the radiator fan assembly replacement on these models. I had similar wear patterns on my S3 after 100000 KM. The thermal switch replacement was a smart preventive move. These often fail around the same time as the fan motor, and a faulty switch can prevent proper engine cooling even with a new fan. About that coolant system wear, definitely monitor those coolant levels closely. Our engines tend to develop small leaks around that mileage. When I noticed similar wear signs, I started checking coolant monthly. This helped catch a small leak early before it caused any temperature control issues. Also worth mentioning, if you hear any unusual sounds from the new radiator fan, get it checked immediately. Sometimes mounting points can loosen over time, causing fan blade alignment issues. Regular checks of the fan operation can prevent future overheating problems.

Thanks for all the input. Yeah, keeping a close eye on the coolant levels now after that car overheating scare. The new radiator fan is working great, no more concerning fan noise or temperature spikes. The cooling system seems to be functioning exactly as it should. The mechanic gave me a heads up about checking the mounting points every few months to make sure the fan stays properly aligned. Makes sense since a loose thermal switch or misaligned fan could bring back those engine cooling problems. Good to learn that these issues are somewhat common around the 100000 KM mark. The 450 Euro repair bill was worth it to prevent more serious engine damage. Will definitely stay on top of the preventive maintenance this time around. Thanks again for sharing your similar experiences, really helped confirm I was on the right track with the diagnosis.