How to Test a Capacitor for a Freezer | Home Guides | SF Gate How to Test a Capacitor for a Freezer. Unscrew and remove the screws holding the freezer’s electrical access panel in place, then lift off the access panel to expose the freezer’s capacitor. The access panel typically is located on the back of the freezer, and the capacitor is connected to the freezer’s What Makes a Refrigerator Run Capacitor Go Bad? | Hunker The run capacitor is located in a white or black box near the compressor. The wiring in this box tells the refrigerator's compressor when it needs to run to cool the refrigerator's contents. Normally, a compressor should run only a few of times an hour, but it may run more often if the refrigerator is opened and used frequently.