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2. Core plug - Wikipedia

   en.wikipedia.org/wiki/Core_plug

   The slang term "freeze plug" was coined many decades ago based on the mistaken belief that the primary purpose of the core plugs was to protect the engine block against freezing. Core plugs were initially designed merely as a necessary engine block component which was made necessary due to the "sand casting" method used to initially form an ...

3. Block heater - Wikipedia

   en.wikipedia.org/wiki/Block_heater

   The most common type of block heater is an electric heating element in the engine block, which is connected through a power cord often routed through the vehicle's grille. Some block heaters are designed to replace one of the engine's core plugs and therefore heat the engine via the coolant. [4] Alternative methods of warming an engine include: [5]

4. Radiator (engine cooling) - Wikipedia

   en.wikipedia.org/wiki/Radiator_(engine_cooling)

   A system of valves or baffles, or both, is usually incorporated to simultaneously operate a small radiator inside the vehicle. This small radiator, and the associated blower fan, is called the heater core, and serves to warm the cabin interior. Like the radiator, the heater core acts by removing heat from the engine.

5. Fusible plug - Wikipedia

   en.wikipedia.org/wiki/Fusible_plug

   A drawing of a fusible plug, showing the tapered core. A fusible plug is a threaded cylinder of metal, usually bronze, brass or gunmetal, with a tapered hole drilled completely through its length. This hole is sealed with a metal of low melting point that flows away if a predetermined high temperature is reached.

6. Freeze stat - Wikipedia

   en.wikipedia.org/wiki/Freeze_stat

   In practical situations, when an air coil freeze stat is not used, bypassed, or defeated, the air coil can freeze, and this causes a lack of air flow to the facility. [3] By contrast, when a water coil freeze stat is not used, the water coil can get so cold that it can freeze the cooling liquid in the exchanger and burst the exchanger. [5]

7. Crankcase heater - Wikipedia

   en.wikipedia.org/wiki/Crankcase_heater

   Some air conditioning equipment manufacturers install crankcase heaters either in the compressor (insertion type), or mount them externally around the base of the compressor (bellyband type). The two wires of the heater are wired directly to the input side of the contact from the main power supply, and power is always supplied to the heater.