Coolant needs changing because chemicals in the coolant break down and become less effective over time. This use ends up ...

Most vehicles now employ an expansion tank that allows the coolant to expand, and exit, the cooling circuit when hot, and to return when the car is turned off and the engine cools. The cooling ...

Liquid cooled engines have more uniform cooling and they must have a radiator. Either of these can have a supplementary oil cooler, which has a small radiator that takes away the heat from the oil ...