I just completed a rebuild of an old "Pop" cooler at our local store. It had a burned out compressor motor, a bad condenser fan, and a plugged up capillary tube. There was also a lot of dust and lint covering everything.
This is the complete compressor unit assembled on my work bench.
Here is the compressor being installed in the cooler. On the floor by the door is my vacuum pump. This is used to evacuate the system to ensure that it is dry and clean before adding the new refrigerant.