Cooling Fan Not Working on Audi Q5 (FY) (2018-2024)

If you're experiencing issues with the cooling fan not working on your Audi Q5, it’s crucial to address the problem promptly to prevent engine overheating. Below is a detailed, step-by-step guide to diagnosing and fixing this issue.

Tools Required

• OBD-II scanner
• Multimeter
• Test light
• Screwdrivers
• Socket wrench set
• Electrical contact cleaner

Step 1: Check for Diagnostic Trouble Codes (DTCs)

1. Connect the OBD-II Scanner:

   • Locate the OBD-II port under the dashboard.
   • Connect the scanner and check for any stored trouble codes that might relate to the cooling fan or temperature sensors.

2. Analyze Codes:

   • Look for codes such as P0480 (Cooling Fan 1 Control Circuit) or P0481 (Cooling Fan 2 Control Circuit).
   • If codes are present, note them down for further investigation.

Step 2: Inspect Fuses and Relays

1. Locate Fuse Box:

   • The main fuse box is typically in the engine bay. Refer to the owner’s manual for the exact location.

2. Check Fuses:

   • Identify the cooling fan fuse using the diagram on the fuse box cover.
   • Use a test light or multimeter to check for continuity. Replace if blown.

3. Check Relays:

   • Locate the cooling fan relay.
   • Swap the relay with a similar one from the fuse box to see if the fan starts working.
   • If swapping the relay resolves the issue, replace the faulty relay.

Step 3: Inspect the Cooling Fan Motor

1. Direct Power Test:
   • Disconnect the fan motor connector.
   • Using jumper wires, connect the fan motor directly to the battery.
   • If the fan doesn’t run, the fan motor is likely faulty and needs replacement.

Step 4: Examine Wiring and Connectors

1. Visual Inspection:

   • Inspect the wiring harness for any obvious signs of damage such as fraying or corrosion.
   • Check connectors for bent pins or corrosion.

2. Continuity Test:

   • Use a multimeter to check for continuity between the fan connector and the relay/fuse box.
   • Repair any damaged wiring as needed.

Step 5: Test Temperature Sensors

1. Locate Temperature Sensors:

   • The coolant temperature sensor (CTS) is typically located near the thermostat housing.

2. Check Sensor Operation:

   • Use the multimeter to measure the resistance across the sensor terminals.
   • Compare the readings to factory specifications (refer to the service manual).
   • Replace the sensor if readings are outside the specified range.

Repair Instructions

Replacing the Cooling Fan Motor

1. Remove the Fan Shroud:

   • Disconnect the battery to prevent electrical shorts.
   • Remove any bolts securing the fan shroud to the radiator.

2. Disconnect the Fan Motor:

   • Unplug the electrical connector from the fan motor.
   • Remove the mounting bolts and take out the fan motor assembly.

3. Install New Fan Motor:

   • Position the new fan motor and secure it with bolts.
   • Reconnect the electrical connector.

4. Reinstall the Fan Shroud:

   • Secure the fan shroud back onto the radiator.
   • Reconnect the battery and test the fan operation.

Final Testing

• Start the engine and let it idle to reach operating temperature.
• Monitor to see if the fan engages as expected.
• Test the air conditioning system to ensure the fan operates when the A/C is on.

By following these steps, you should be able to diagnose and repair the cooling fan issue on your Audi Q5. If the problem persists after these steps, it may require further diagnosis by a professional technician.