2020 Audi S5 Radiator Fan Isn't Working

Diagnosing the Causes of a Non-Functioning Radiator Fan in Your 2020 Audi S5 and How to Fix It

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
34% chance it's the
Fan Motor or Clutch
0%
28% chance it's the
Fan Relay or Fuse
0%
23% chance it's the
Temp Sensor or Fan Control Module
0%
15% chance it's
Something else
The most common reasons a 2020 Audi S5 radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor.
  • Fan Motor or Clutch: A faulty fan motor or a malfunctioning fan clutch can result in inadequate cooling, causing the engine to overheat.
  • Fan Relay or Fuse: A faulty fan relay or blown fuse can prevent the cooling fan from operating, leading to engine overheating.
  • Temp Sensor or Fan Control Module: A faulty temperature sensor or fan control module can result in incorrect readings, causing the engine to overheat or the cooling fan to operate improperly.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Audi S5 radiator fan isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Over time serpentine belts stretch, crack, and the ribs that ride on the accessory pulleys being to wear smooth. A squealing noise that increases with engine speed or as engine driven accessories are turned on may be noted. The noise is caused by the belt slipping on the pulleys, insufficiently driving them. Ineffective air conditioning, a battery warning light, or intermittent power steering assist can result from this.

»MORE: Symptoms of a bad serpentine belt

The bad thermostat can cause two different sets of problems, depending on whether it's stuck open or stuck closed.

A thermostat that is stuck open can cause the engine to run colder than normal and turn on the check engine light. It may also cause poor fuel mileage and the heater to blow cool air.

A thermostat that is stuck closed will cause the vehicle to overheat. If a new thermostat doesn't resolve engine temperature problems, the cooling system needs to be checked for other issues.

» LEARN MORE: Signs of a bad thermostat, and how to fix it

When the engine coolant temperature sensor fails, it will send inaccurate information to the vehicle’s computer, causing the computer to react to false operating conditions. This will cause the engine to consume more fuel than normal, depleting fuel mileage, and causing black, sooty smoke from the engine under moderate to heavy acceleration. The check engine light will illuminate, and on-board diagnostic trouble codes may be stored for exhaust and emission system failure, fuel delivery system failure, and engine cooling system failure. Overheating may also occur, as the coolant sensor may be leaking fluid out of the engine, creating a an air pocket in the system.

What are the initial diagnostic steps to take when the radiator fan isn't working on a 2020 Audi S5?

When faced with a non-functioning radiator fan in your 2020 Audi S5, it's essential to adopt a systematic diagnostic approach to identify the root cause effectively. Begin by checking the fuse associated with the radiator fan, as a blown fuse is a common and easily rectifiable issue that can halt fan operation. If the fuse is intact, the next step is to inspect the relay that controls the fan; a malfunctioning relay can disrupt the electrical flow necessary for the fan to operate. Following this, test the radiator fan motor itself to ensure it is functioning correctly, as a defective motor will require replacement. Additionally, verify the temperature sensor's functionality, as it is crucial for activating the fan when needed. Don't overlook the wiring connections; examine them for any signs of damage or corrosion that could impede power delivery to the fan. Finally, utilizing a diagnostic tool to scan for error codes can provide valuable insights into any underlying issues within the radiator fan system. By methodically following these steps, you can effectively diagnose and address the radiator fan problem in your Audi S5, ensuring optimal vehicle performance.

What are the common problems that could cause the radiator fan to stop working in a 2020 Audi S5?

When diagnosing why the radiator fan in a 2020 Audi S5 has stopped working, it's crucial to consider several common problems that could be at play. A faulty fan motor is often the primary suspect, as it can fail to spin, leading to overheating issues. Additionally, a blown fuse in the fan circuit can interrupt the power supply, effectively shutting down the fan's operation. Another potential culprit is a defective temperature sensor, which may fail to signal the fan to activate when the engine reaches a certain temperature. It's also important to check for any physical damage, such as broken fan blades, which can hinder airflow and cooling efficiency. Lastly, wiring issues can disrupt the electrical connection between the fan and the vehicle's system, preventing it from functioning properly. Addressing these issues promptly is essential to avoid engine overheating and ensure the longevity of your vehicle. Regular maintenance and inspections can help catch these problems early, allowing for timely repairs and peace of mind while driving.

How urgent is it to address the non-functioning radiator fan in a 2020 Audi S5?

Addressing a non-functioning radiator fan in a 2020 Audi S5 is of utmost urgency due to the critical role it plays in the vehicle's cooling system. When the radiator fan fails, the engine is at risk of overheating, which can lead to severe damage to vital components, resulting in costly repairs and potential engine failure. This not only compromises the vehicle's performance but can also leave you stranded, necessitating extensive repairs that could have been avoided with prompt action. Furthermore, an overheating engine can negatively impact fuel efficiency, leading to increased operational costs. Therefore, if you notice any signs of a malfunctioning radiator fan, it is essential to diagnose and address the issue immediately. Taking swift action not only protects your investment but also ensures the safety and reliability of your vehicle on the road.

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