Replacement of a cooling liquid - broad-brush observations
The merged cooling liquid should not be applied repeatedly. The cooling liquid is toxic and should not merge in household мусороприемники at all and the water drain!
The cooling liquid should be replaced each time at performance of the repair work connected with опорожнением of system of cooling, and also works on replacement of components of the engine, - in the course of circulation of a cooling liquid anticorrosive additives entering into its structure are besieged on a surface of new details, forming a protective layer preventing development of corrosion.