The anti freezing agent used in the radiator of an automobile is

Explanation

Ethylene glycol is commonly used as an antifreeze agent in the radiator of automobiles. It is added to the water in the radiator to lower its freezing point and raise its boiling point, thus preventing the engine coolant from freezing in cold temperatures and boiling in hot temperatures. Ethylene glycol is preferred due to its effectiveness, low cost, and relatively low toxicity compared to alternatives like methanol.