Abstract: Molded to a plastic water chamber for transverse-flow radiators of internal-combustion engines is the lower part of a two part storage, air venting and balancing chamber, through which an ancillary coolant flow passes, and wherein the normal range of the coolant level is located at an upper part of the balancing chamber which is connected to the lower part of the balancing chamber, and wherein said upper part is transparent for observation of the coolant level.

Abstract: A transverse-flow radiator for internal combustion engines, which is equipped with a plastic water chamber and a balancing chamber joined to this water chamber and wherein by an air venting line from leading from a high point of the water chamber via a liquid lock molded onto the balancing chamber, and wherein a vertical main part of the venting line has a lower molded-out opening which controls a discharge valve with discharge connections that can be mutually connected or closed off which lead to the water chamber, the balancing chamber and a discharge opening.