Cooling fan not working Audi A6

Cooling Fan Not Working - Audi A6 C7 (2011-2018)

Tools Required

• OBD-II scanner
• Digital multimeter
• Basic hand tools (screwdrivers, pliers, etc.)
• Wiring diagram for Audi A6 C7 cooling system
• Test light

Step 1: Visual Inspection

1. Check for Obstructions: Ensure there are no physical obstructions in the fan blades.
2. Inspect Fuses: Locate and inspect the cooling fan fuse in the fuse box. Refer to the owner's manual for the exact location and rating.
3. Fan Relay: Check the fan relay for any signs of damage or corrosion.

Step 2: Electrical Testing

1. Scan for Trouble Codes:

   • Use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the cooling system or fan operation.

2. Voltage Supply:

   • Using a digital multimeter, check for voltage at the cooling fan connector.
   • With the ignition on, there should be voltage present. If not, trace the issue back to the relay or wiring.

3. Relay Functionality:

   • Test the cooling fan relay by swapping it with a similar relay in the fuse box. If the fan operates with a different relay, the original may be faulty.

4. Check Ground Connection:

   • Ensure the fan motor ground is secure and free of corrosion.

Step 3: Component Testing

1. Cooling Fan Motor:

   • Directly supply power to the cooling fan motor using jumper wires from the battery. If the fan does not operate, the motor is likely faulty and requires replacement.

2. Thermostatic Switch / Temperature Sensor:

   • Test the thermostatic switch or engine coolant temperature sensor using a multimeter. Compare readings with manufacturer specifications. Replace if defective.

Repair Instructions

Replacement of Cooling Fan Motor

1. Disconnect Battery:

   • Disconnect the negative terminal of the battery to ensure safety.

2. Remove Radiator Shroud:

   • Remove any covers or components obstructing access to the cooling fan, such as the radiator shroud.

3. Disconnect Fan Wiring:

   • Unplug the fan connector and remove any securing clips or bolts.

4. Remove Cooling Fan:

   • Unbolt the cooling fan assembly from the radiator support and carefully remove it.

5. Install New Fan:

   • Position the new cooling fan assembly and secure it with bolts.
   • Reconnect the fan wiring and ensure all clips and connectors are properly seated.

6. Reassemble Components:

   • Reinstall any removed covers or components, such as the radiator shroud.

7. Reconnect Battery:

   • Reconnect the negative terminal of the battery.

8. Test Operation:

   • Start the engine and allow it to reach operating temperature.
   • Confirm that the fan activates as expected and that engine temperature remains stable.

Final Checks

• Ensure all tools and components are accounted for and properly stored.
• Clear any codes from the vehicle’s computer using the OBD-II scanner.
• Test drive the vehicle to verify the cooling system is functioning correctly.

Conclusion

By following these diagnostic and repair steps, you should be able to address cooling fan issues in an Audi A6 C7 effectively, ensuring optimal engine temperature management and restoring proper air conditioning function.