What does overcooling mean?

: to cool excessively : to lose or to cause (something or someone) to lose too much heat or warmth … has a dehumidifying cycle that's supposed to dry out a humid room without overcooling it. — Consumer Reports Conventional greenhouse additions overheat, overcool and tend to frost up when it's cold and windy. —

Is overcooling a thing?

Overcooling most commonly occurs when the coolant bypasses a defective water temperature regulator and flows directly to the radiator preventing the engine from reaching normal operating temperature. ... Learn more about getting a coolant analysis program started with POLARIS Laboratories®.