Audi A6 Cooling Fan Malfunction Causes Overheat Risk

Having experienced similar symptoms with my 2016 Audi A4 2.0T, this sounds like a classic case of a faulty fan motor or its electrical connections. The radiator fan behavior matches what I encountered, either running non-stop or failing to engage when needed. The constant overheating despite proper coolant levels typically points to the electric fan not operating correctly. In my case, the problem stemmed from corroded wiring connectors at the fan motor assembly. The temperature control module was receiving incorrect signals, causing the cooling system to malfunction. The repair required: Testing the fan motor circuit, Replacing damaged connector pins, Installing new wiring harness for the cooling fan, Recalibrating the temperature control module This was a serious issue requiring immediate attention, as continued overheating risks engine damage. The fan motor assembly in these models is known to develop electrical faults, particularly at the connection points. A complete diagnostic test of the cooling system and fan motor circuit would be advisable. The symptoms suggest either a failing electric fan motor or compromised electrical connections, rather than a coolant circulation issue.

Thanks for sharing that detailed fix. The overheating issues with my A6 were driving me crazy, especially with that constant radiator fan noise. Your solution sounds exactly like what I was dealing with. Really helpful to know about those corroded connectors, seems like a common weak point in the cooling system. Would you mind sharing how much the complete repair ended up costing? Also curious if youve had any temperature control problems since getting it fixed? My vehicle overheating concerns have me worried about potential long-term issues. Just want to make sure I budget properly before heading to the shop for what sounds like a similar repair job.

Since getting the fan motor connection repaired, my Audi A4 has maintained perfect temperature control. The repair was straightforward, a damaged wire and connector in the engine cooling system were causing the radiator fan malfunction. Total cost came to 95 Euro, which covered fixing the electrical connection and testing the cooling system. The temperature gauge now stays steady and the fan cycles normally. No more overheating issues or strange fan behavior in the 8 months since the repair. The mechanic mentioned these electrical problems are fairly common in the cooling system, but once fixed properly, they rarely return. For reference, catching this early likely saved a lot of money, if the constant overheating had continued, it could have led to more serious engine damage. The engine cooling system now works exactly as designed, with the radiator fan kicking in only when needed.

Thanks for the feedback. I finally got my A6 fixed last week and wanted to close the loop on this thread. Took it to a different shop that specializes in European cars. Turns out it was exactly what you described, corroded wiring at the electric fan motor connection. The repair involved replacing the entire fan motor assembly and fixing some damaged wiring in the engine cooling system. Total cost was 320 Euro, which included a full diagnostic of the temperature control system. More than your repair but still worth every cent. The engine cooling is now perfect, no more overheating or strange fan behavior. The radiator fan cycles normally and the temperature gauge stays right where it should. Such a relief to have this fixed properly after months of worry. Really appreciate the guidance from this forum. Would have wasted more time and money without your specific insights about the electrical connections. This experience taught me to pay attention to even minor cooling system issues before they become major problems.