Antifreeze is a chemical additive that is used to lower the freezing point of water. Ethylene glycol has been the dominant antifreeze for half a century, but recent studies are indicating the possible return of a long-forgotten solution to this age-old problem.
Radiator cooling fans can be either mechanical or electric, and they help push or pull air through the radiator. However, these fans aren’t responsible for the bulk of the cooling that a radiator performs.
Drive belts transfer power from the crank or camshaft to the alternator, air conditioner, and other accessories. The first belts were leather, but they’ve been made from rubber and various polymers since the 1920s.