Disassembling the fan unit
1. Remove the fan motor (1).
2. Remove the air filter (2).
3. Remove the motor controlling the internal/external air circulation selector flap (3).
4. Remove the fan housing (4).
Assembling the fan unit
1. Install the fan housing (4).
2. Install the motor to control the internal/external air circulation selection damper (3).
3. Install the air filter (2).
4. Install the fan motor (1).