If the fan doesn't run rapidly, and starts slow in the sun when you have it apart from the rest of the casing, you should probably replace the motor, or that section. If you pop off the fan blade, you can lubricate the shaft, with some thin oil like sewing machine oil, etc... this fixed mine right up. To take off the fan, take thumb and first finger around it and pull it straight off. Another method is to take a small flat screw driver and put it against the back and pull a little at a time working the screw driver around evenly until it pops off.