Audi A6 Fan Issues Causing Critical Engine Overheating

Having experienced similar issues with my 2006 Audi A4 2.0T, the symptoms point to a failing cooling system. When my car started overheating, the root cause was a faulty thermal switch that wasnt properly activating the radiator fan. This caused insufficient engine cooling, particularly during idle or slow-speed driving. The cooling system diagnostic revealed multiple issues: a worn thermal switch, debris restricting coolant flow, and a radiator fan running at reduced speed due to a failing motor. The temperature control issues triggered the check engine light because the ECU detected the engine running outside normal operating ranges. These cooling system problems can lead to serious engine damage if not addressed promptly. The repair involved: Replacing the thermal switch, Flushing the cooling system, Installing a new radiator fan assembly, Checking all coolant hoses for leaks, Testing the water pump operation The slow fan rotation you described matches exactly what I experienced before the repair. The fix restored proper engine cooling and resolved the check engine warning. This type of issue requires immediate attention to prevent potential engine damage. Consider having a complete cooling system diagnostic performed, as multiple components often fail around the same mileage point on these engines.

Thanks for sharing your experience with the thermal switch and radiator fan issues. After my repair was completed, the car radiator started working normally again and the temperature control has been perfect. Just wondering, could you share how much you paid for the full cooling system repair? Also, has everything been running smoothly since the fix, or have you noticed any other cooling-related problems? My Audi mechanic mentioned these issues can sometimes return if not all worn components are replaced at once.

Just had the final checkup today actually. The cooling system repair on my 2006 Audi A4 ended up costing 250 Euro for fixing the faulty speed sensor that was causing the radiator fan to malfunction. The fan motor is now working perfectly, maintaining proper temperature control at all speeds. Since the repair three months ago, the car hasnt shown any signs of overheating. The fan kicks in exactly when it should, and the car radiator is functioning as designed. The thermal switch readings are now consistently normal, which was the main concern before. One important thing the repair revealed was that catching the problem early prevented damage to other cooling components. A complete system check showed everything else was in good condition, so no additional parts needed replacement. Its been great not having to constantly watch the temperature gauge anymore. The car runs perfectly cool even in slow traffic where fan operation is most critical.

After dealing with the overheating issues in my Audi A6, I finally got it properly diagnosed and fixed last week. The mechanic discovered a combination of problems affecting the engine cooling system. The car radiator fan had a worn-out motor and the thermal switch needed replacement. The total repair came to 580 Euro, which included: New radiator fan assembly, Thermal switch replacement, Full system flush, Labor costs The fan noise is now completely normal and the engine cooling works perfectly. The check engine light cleared up right after the repair. Even in heavy traffic, the temperature stays stable. Really glad I got it fixed before any serious damage occurred. Looking back, I should have pushed harder during my first mechanic visit to properly diagnose the radiator fan issue. The car runs so much better now, and the cooling system works exactly as it should. No more stress about watching the temperature gauge.