Cooling fan not working Audi Q5

Cooling Fan Not Working - Audi Q5 8R (2008-2017)

Tools Required

• OBD-II scanner
• Multimeter
• Test light
• Basic hand tools (screwdrivers, pliers, socket set)

Step 1: Check for Diagnostic Trouble Codes (DTCs)

1. Connect the OBD-II Scanner:

   • Locate the OBD-II port under the dashboard on the driver’s side.
   • Connect the OBD-II scanner and check for any stored trouble codes related to the cooling system or fan operation.

2. Analyze Codes:

   • Common codes to look for include P0480 (Cooling Fan 1 Control Circuit) or P0691 (Fan 1 Control Circuit Low).
   • Record any codes found and clear them after noting for further diagnosis.

Step 2: Inspect the Cooling Fan Fuse and Relay

1. Locate Fuse Box:

   • Refer to the vehicle’s manual for the location of the engine compartment fuse box.

2. Check Fuse:

   • Identify the cooling fan fuse and remove it.
   • Use a multimeter to test for continuity. Replace if blown.

3. Inspect Relay:

   • Locate the cooling fan relay.
   • Swap with a similar relay from the fuse box (if available) to test functionality.
   • Listen for a clicking sound when the relay is energized, indicating it is functioning.

Step 3: Test the Cooling Fan Motor

1. Direct Power Test:

   • Disconnect the fan motor connector.
   • Supply 12V power directly to the fan motor using jumper wires.
   • If the fan operates, the motor is functional.

2. Check Voltage at Fan Connector:

   • With the ignition on, use a multimeter to check for voltage at the fan connector.
   • If voltage is present but the fan doesn’t work, the motor may be faulty.

Step 4: Inspect Fan Control Module

1. Locate the Fan Control Module:

   • Usually mounted near the radiator or integrated into the fan assembly.

2. Visual Inspection:

   • Look for signs of damage, corrosion, or overheating on the module.

3. Test Module Output:

   • With the engine running and the A/C on, check for output voltage from the module.
   • If no output is present, the module may be defective.

Step 5: Check Coolant Temperature Sensor

1. Locate Sensor:

   • Typically found near the thermostat housing.

2. Test Sensor:

   • Measure resistance across the sensor terminals at various temperatures to ensure it meets specifications.
   • Replace if readings are out of specification.

Repair Instructions

Replacing the Cooling Fan Motor

1. Remove Fan Assembly:

   • Disconnect the electrical connector.
   • Remove any retaining bolts/screws holding the fan shroud to the radiator.
   • Carefully remove the fan assembly.

2. Install New Motor:

   • Swap the old fan motor with the new one in the assembly.
   • Reinstall the fan assembly, ensuring all connectors and bolts are secure.

Replacing the Fan Control Module

1. Remove the Module:

   • Disconnect electrical connectors.
   • Remove mounting screws or clips.

2. Install New Module:

   • Position the new module in place.
   • Reconnect all electrical connectors and secure the module.

Final Check

1. Test Cooling System:

   • Start the engine and allow it to reach operating temperature.
   • Confirm the cooling fan engages as expected.
   • Ensure the engine does not overheat and all components function correctly.

2. Re-check for DTCs:

   • Use the OBD-II scanner to ensure no new codes have been generated.

By following these steps, you should be able to diagnose and repair a non-functional cooling fan on an Audi Q5 8R. If issues persist, further investigation into wiring or more complex electronic control issues may be required.