Block heater
Videos
A block heater is used in cold climates to warm an engine prior to starting. They are mostly used for car engines; however, they have also been used in aircraft engines.
Electrical cord for powering a block heater
A block heater for a Honda K24-series engine.
A parked car plugged in to an electrical outlet to power the block heater
Core plug
Videos
Core plugs, welch plugs, or freeze plugs are used to fill the sand casting core holes found on water-cooled internal combustion engines.
Block heater
…block, which is connected to an AC power cord often routed through the vehicle's grille. Some block heaters are designed to replace one of the engine's core plugs. Both heat the engine via the coolant. Alternative methods of warming an engine include…
A core plug that has corroded from improper engine coolant maintenance, causing it to leak