If the refrigerator seems to run all the time, then the problem is probably the thermostat. The -49 thermostat consists of a 30"(approx) sensing tube connected at one end to an electric switch box with control knob (the knob is usually labeled "COLDER". The switch box electrical contacts could be stuck closed, or the sensing tube has been damaged such that the switch box is getting the wrong signal. In either case, replacing the the thermostat module/sensing tube should solve the problem. These modules cost in the range of $50 to $100.
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