How to Troubleshoot an Ammonia Evaporator

Level the fridge by placing a level at the bottom of the freezer door and verifying the bubble is in the middle of the device. If the fridge isn't level, adjust it until it is. Often when an ammonia evaporator is tilted, it won't work properly. Driving with the fridge shouldn't be a problem because constant motion prevents the ammonia from pooling; but the leveling is a concern when the fridge is still. However, operating the fridge while it is in motion is not advised.

Inspect the tubes leading to the evaporator. They should be coated in thermal mastic. If not, the evaporator won't work properly and the ammonia won't provide the necessary cooling for the fridge.

Examine the evaporator for signs of rusting. Evaporators are usually galvanized and should be rust-resistant; but if there is slight rust, remove it with fine sandpaper or a rust remover. Turn off the fridge before doing this. A severely rusted evaporator requires replacement.

Sniff the air around the fridge. If you detect a strong smell of ammonia, the evaporator is likely leaking and requires professional repair.