In the airduct in the footwell there is a resistor pack which regulates the blower fan speed. This will be the cause of the initial problem of the fan only working on position 4. Now that the fan is not working at all check fuses and relays. The blower fan also has an inline thermal fuse inside the motor which could be blown, this happened to mine. It is very tricky to remove the fan motor, I was able to remove it through the firewall air duct.