the present invention relates to an aqueous glycol - free heat transfer fluid comprising sebacic acid , benzotriazole , morpholine , and at least one of sodium nitrite and sodium molybdate dihydrate , wherein a sum of concentrations of sodium molybdate dihydrate , sebacic acid , benzotriazole , morpholine , sodium nitrite is equal to or less than 1 % . preferably , the sum of concentrations of sodium molybdate dihydrate , sodium nitrite , sebacic acid , benzotriazole and morpholine is less than 0 . 65 % . preferably , the respective concentration is : 0 - 0 . 134 % sodium molybdate dihydrate ; 0 - 0 . 028 % sebacic acid ; 0 - 0 . 028 % benzotriazole ; 0 . 08 - 0 . 812 % morpholine and 0 - 0 . 134 % sodium nitrite .