noun
cooling device; cooler; refrigerator; freezer; radiator
General term for a device that cools something. Context determines whether it refers to a refrigerator, freezer, cooler, or a car radiator. For household refrigerators, 冷蔵庫 is more common.
この冷却器は水を素早く冷やします。
This cooler chills water quickly.
車の冷却器が故
The car's radiator broke down and the engine overheated.
Specifically a freezer compartment or standalone freezer. 冷却器 can also mean freezer but is less specific.
Common loanword for a car radiator. 冷却器 is the native Japanese equivalent, often used in technical contexts.
Compound of 冷却 (cooling) + 器 (device, instrument).