Disclosed are coolants comprising brazed
metal corrosion inhibitors. In one embodiment, the disclosed brazed
metal corrosion inhibitor will comprise a polycarboxylic acid functional compound having the structure: wherein R1, R2, R3, and R4 are each independently selected from the group consisting of H, OH, COOH, C1-C10
alkyl groups, glycol esters, anhydride groups, —COOM, and combinations thereof, wherein M is at least one of H,
alkali metal ions, alkali earth
metal ions, NH4+, amines, imidazoline, polyalcohol esters, C1 to C12
alkyl groups, and combinations thereof; wherein (1) at least three of R1, R2, R3, and R4 contain the group —COOM, wherein M is defined above; or (2) at least two of R1, R2, R3, and R4 contain an anhydride group, and at least one of R1, R2, R3, and R4 contain the group —COOM, wherein M is defined above.