Silicate-free cooling liquids based on organic acids and carbamates having improved corrosion properties

A coolant or antifreeze concentrate comprising:

• a) from 0.05 to 5% by weight of one or more carbamates of the formula
• in which
• X is O or S,
• R is C1- to C8-alkyl or C6- to C18-aryl, or the ammonium salts thereof,
• b) from 0.05 to 4% by weight of a tricarboxylic acid or of a triazinetriiminocarboxylic acid, or a mixture thereof,
• c) from 0.05 to 8% by weight of a mono- or a dicarboxylic acid having 4 to 16 carbon atoms, or a mixture thereof, in the form of their alkali metal or ammonium salts,
• d) from 0.01 to 2% by weight of a hydrocarbon-triazole or hydrocarbon-thiazole, or a mixture thereof,
• e) from 0.01 to 2% by weight of a water-soluble alkali metal salt or alkaline earth metal salt, or a mixture thereof, and
• f) from 80 to 99% by weight of a compound selected from the group consisting of an alkylene glycol, a polyglycol, a glycerol, and mixtures thereof.