<!-- from fixya rte -->GSL25SFRFBS KNOCKING AND NOT COOLING - GE GSH25JFR Side by Side Refrigerator

If your knocking sound like like a ding of a bell and then stop once started and rings again when it stops, the internal compressor motor mounts have come loose. These mounts are just spring mounts that are pressed into the bottom of the motor and if the refrigerator during handling or shipment has been bounced badly, these spring mounts can become loose. These other cause for knocking is the comressor shaft probably sheared. This is a rare occurance but I have found it and it could explain the not cooling. If your refrigerator is inside of the warranty call the toll free number and pay the minimal charge and have factory trained technician install an new compressor and filter drier (pencil drier/filter). If it is not inside the warranty period, the cost to repair the refrigerator will normally cost more than simply replacing the unit with an new one.