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There are many Whirlpool refrigerator parts, Amana refrigerator parts, and Sub Zero parts to check when trying to diagnose a freezer. One of the most important things you should check in the case of low cold air flow? Refrigerant leaks. Leaks are considered rare, but if you have ever attempted to defrost a freezer by chipping away at the ice, you should definitely check for a refrigerant leak. The refrigerator parts that make up the cooling system are part of what's known as a closed system. This means that only a trained professional should attempt to repair it. Refrigerant leaks are a health hazard; if you suspect a leak, call a professional immediately.