Audi Fan Error: Troubleshooting Guide (Solution)

Author: Michael II

Audi A6 (4B), A4 (8E), and Cabriolet (8H).
The electric fan is either not working or running constantly, which in the first case causes the coolant temperature to become too high, and in the second case, prevents the engine from starting due to a dead battery.

Cause:
Component defect in the control unit for the electric fan.

Solution:
In order to reliably eliminate the error, it is necessary to differentiate between various error scenarios.

Case 1:
The electric fan is not working, which is causing the coolant temperature to rise too high. There is an error code stored in the fault memory related to the fan control unit.
In this case, the control unit for the radiator fan needs to be replaced. Component defects can occur in control units that were manufactured up to production date 168 of the year 2003.


Case 2:
The vehicle won't start due to a dead battery, or alternatively, the fans continue to run even after the afterglow period has ended, with the ignition switched off (the afterglow period is a maximum of 12 minutes).


1. Check the power supply relay for the J271 engine control unit to ensure it is functioning correctly, and replace it if necessary.

2. Inspect the wiring connected to terminal 87 in the fuse box for any damage to the insulation.

3. Check the electrical box for water ingress.
Please provide the text you would like me to translate from German to English.
Bye.

Michael.