Is your blower fan working only on the 4th speed?
This is a common problem for this generation of Volkswagen-Audi-Group cars.
You need a new resistor block, or just the thermal fuse.
For this car you need a 192°C, 250V, 10A thermal fuse.
Resistor block serial number: 1j0819022a

If you have the same problem on your Vw Golf 4 / Bora / Skoda Octavia 1, the repairing method is similar. You need to dismantle the dashboard to reach the blower fan and fan resistor.

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