The invention concerns a concentrated coolant intended to be added to a heat transfer liquid to lower the freezing temperature of same, said coolant comprising a C2-C6 glycol, water in an amount of less than 10% by mass and corrosion inhibitors, said corrosion inhibitors being a mixture of at least a C7-C11 aliphatic monocarboxylic acid and a C4-C15 aliphatic dicarboxylic acid, characterised in that it comprises an amount of said C4-C15 aliphatic dicarboxylic acid of between 0.1 and 1% and an amount of said C7-C11 aliphatic monocarboxylic acid greater than or equal to 0.5% and less than 4%, the ratio between said C7-C11 aliphatic monocarboxylic acid and said C4-C15 aliphatic dicarboxylic acid being between 3 and 7.
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