Abstract: A corrosion-inhibited antifreeze concentrate formulation containing no phosphate, amine, or nitrite compounds consists essentially of:(a) a major amount of a water soluble liquid alcohol freezing point depressant;(b) from 0.1-5.0 weight percent of a C.sub.6 -C.sub.12 aliphatic monobasic acid or the alkali metal salt thereof;(c) from 0.1-5.0 weight percent of an alkali metal borate compound; and(d) from 0.1-5.0 weight percent of a hydrocarbyl triazole.The concentrate formulation and aqueous antifreeze formulations of the instant invention give synergistic corrosion protection for a variety of metal surfaces as compared with compositions containing only the aliphatic monobasic acid/salt or alkali metal borate component alone.