How to diagnose and fix a defective cooling fan in my Audi 80?

My Audi 80's cooling fan seems to be malfunctioning and my engine is starting to overheat. How can I properly diagnose the issue and fix it before it causes any further damage?

First, check the fuse for the cooling fan and replace if necessary. Then, examine the fan itself and make sure it is spinning freely without any obstructions. If the fan still doesn't work, the issue may lie with the fan motor, which will need to be replaced.

One possible cause of a faulty cooling fan could be a faulty temperature sensor. Check the sensor's connection and replace if necessary. It's also a good idea to clean any debris or dirt off the sensor to ensure proper function.

Make sure to also check the wiring and connections for any damage or loose connections. Sometimes a simple fix like tightening a loose wire can solve the issue.