Abstract: Disclosed is a method for cooling heated molds from a machine for molding containers from thermoplastic material by stretch-blow molding hot preforms using at least one pressurized fluid. The cooling method includes, in order to cool the molds, at least one cooling step that involves selectively feeding at least one cooling fluid into the molding cavity of at least some of the molding units that, after the carousel has been stopped in order to immobilize the molding units at least during the cooling step, are located in a predetermined cooling region in which the molding units are in a closed position.