Audi A1 Fan Failure Causing Critical Engine Overheating

Had the same issue with my Audi A3 2017 gasoline. The temperature control system showed similar symptoms, irregular electric fan operation and vehicle overheating in traffic. The root cause was a faulty fan clutch connector and corroded wiring harness affecting the temperature sensor signals. The electric fan would either activate too late or not engage at all, causing the engine temperature to spike unexpectedly. This turned out to be a serious issue requiring immediate attention. If left unaddressed, it could lead to engine damage from consistent overheating. The repair involved: Testing the fan control module, Replacing the damaged wiring harness, Installing a new fan clutch assembly, Recalibrating the temperature control system Recommend having a technician specifically check: 1. Fan control module functionality 2. Wiring connections at the radiator fan 3. Temperature sensor operation 4. Coolant level and circulation 5. Thermostat response A complete diagnostic of the cooling system is essential since irregular fan operation often indicates underlying electrical issues beyond just the visible components.

Thanks for sharing your experience with the A3 fan issues. Mine got fixed last month and seems to be running fine now with the radiator fan kicking in properly. The engine cooling system is maintaining steady temperatures even in stop-and-go traffic. Just curious, do you remember the total repair cost for your fan motor and wiring replacement? Also, has everything been working smoothly since the fix or have you noticed any other cooling-related problems?

Good to hear your cooling system is now working properly. The fix on my A3 was actually quite straightforward, just needed a repair of the electric fan wiring connection which cost 95 Euro. The electric motor itself was fine, just the cable connector was damaged and causing intermittent operation. Since the repair, the temperature control has been perfect with no overheating issues. The electric fan kicks in exactly when needed, especially during slow traffic or hot weather. No other cooling problems have surfaced in the past months. The investment was definitely worth it to prevent potential engine damage from overheating. If you notice any future irregularities with the fan operation, get it checked immediately. These temperature control issues often start small but can develop into bigger problems if ignored.

After reading about similar A3 issues, I finally got my A1 fixed last week. The mechanic I went to specialized in cooling system diagnostics and found the issue right away, a failing temperature sensor and damaged wiring harness causing the vehicle overheating problems. The repair took about 3 hours and cost 280 Euro, including parts and labor. They replaced the faulty sensor, repaired the wiring, and did a complete check of the engine cooling system. Money well spent considering the risk of serious engine damage from constant overheating. The electric motor for the fan now kicks in exactly when needed, and the temperature stays steady even in stop-start traffic. Really glad I got a second opinion from a specialist rather than continuing with my regular mechanic who missed these issues initially.

Hi! I have an A1 which, when the water reaches 90 degrees, starts the fan and it runs continuously. I mention that I have changed the two temperature sensors and that the water never cools down below 90 degrees. What could be the causes and how could I get rid of this?

(Translated from Romanian)

Check if the thermostat is functioning properly. A stuck thermostat can prevent coolant from circulating effectively, causing the fan to run continuously. If the thermostat is stuck closed, it won't allow coolant to flow through the radiator to cool down, keeping the temperature high. Consider having the thermostat inspected and replaced if necessary. Let me know how it goes or if you have any further questions!

If it were blocked for hours, would liquid still come out of the return pipe from the expansion tank?

(Translated from Romanian)

Yes, if the thermostat is stuck closed, you might still see some coolant flow from the return pipe due to pressure build-up, but it won't be sufficient for proper cooling. It's important to check the thermostat as it could still be partially opening or closing, affecting the cooling efficiency. If you haven't already, have the thermostat tested or replaced to ensure it's functioning correctly. Let me know if you need further assistance!

Thank you for the advice

(Translated from Romanian)