Dell Inspiron 16 5635 Owner's Manual page 44

Steps
1. Align the screw holes of the fan with the screw holes on the palm-rest and keyboard assembly.
2. Replace the three screws (M2x3) to secure the fan to the palm-rest and keyboard assembly.
3. Connect the fan cable to the system board.
Next steps
1. Install the base cover.
2. Follow the procedure in After working inside your computer.
44 Removing and installing Customer Replaceable Units (CRUs)