Condenser fan not working

I have an older (approx 20 yrs) Amana "Free-O-Frost" 27 side by side refrigerator freezer, and I cannot find the model number anywhere. The refrigerator is warm, the compressor and compressor fan are running, the condenser coils are cold and frosty, and the evaporator fan and freezer light are not working. I checked the evaporator fan, which has 34ohms and works when connected to 120V. I replaced the defrost thermostat and nothing changed. Any other suggestions?