If you could post the make & model number it would help to ID the components. All units of the chest / coffin case design, will either be static or air cooled. Static designs do not have a condenser fan but could have an evaporator fan. The condenser could be located on the back of the unit, or will be inside the lining of the shell. The air cooled units will have both a condenser & evaporator fan. Both will need to be operating during the freezing cycle to allow heat exchange, cool down to take place. The condenser fan is normally electrically in series with the compressor (anytime the compressor is running the fan is also on). The evaporator fan may or may not be on depending on the way it is wired. Items that could cause compressor overheating, Most refers & frzrs need to have a air space (standoff distance between the unit and the wall, about 4" min). Gasket / seals leaking air, fans not operating, evaporator frosted over (manual defrost or defrost component failure, auto defrost). Weak or over charged compressor. The thermostat not cycling off is rare. The electrical use issue could be verified by a load test with a multi-meter & or amp meter. Although a 23 yr old unit could be suspect, most were made way better the some of the junk today. Static - no fan units only operate 20 - 30 % of the time. Once they cool down and freeze everything the t-stat will not cycle very often. The list of tests & diagnostics can be more detailed a good technician with sealed systems back ground should have no problem during a house call.
Defrost problem.
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please submit make and model info for detailed help. Ric
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