NOVELTY - A corrosion inhibiting coolant comprises acid functional corrosion inhibiting component. The acid functional corrosion inhibiting component comprises a brazed metal corrosion inhibitor. The brazed metal corrosion inhibitor comprises a poly carboxylic acid functional compound.    USE - The coolant is useful for inhibiting corrosion in brazed aluminum surfaces used in cooling system component for cooling system (claimed) used in transportation vehicles, e.g. fuel cell powered vehicles.    ADVANTAGE - The invention provides corrosion inhibiting effect. It inhibits and/or prevents the formation and action of corrosion on metal components joined by brazing processes, e.g. brazed metal surfaces or components, particularly brazed aluminum surfaces. It improves corrosion protection of metallic components in the system. It reduces leaching of halogen ions, e.g. fluorine ions from any residual brazing flux agent on brazed metal surface in the vehicle cooling. It prevents leaching or solubilization of halogen ions into the coolant. The amount of inhibitor released from the resin depends on the corrosion protection need of the coolant.    DETAILED DESCRIPTION - A corrosion inhibiting coolant comprises acid functional corrosion inhibiting component. The acid functional corrosion inhibiting component comprises a brazed metal corrosion inhibitor. The brazed metal corrosion inhibitor comprises a poly carboxylic acid functional compound of structure (I).    M = H, alkali metal ions, alkali earth metal ions, ammonium ion, amines, imidazoline, polyalcohol esters, and/or 1-12C alkyl groups; and    R1-R4 = H, OH, COOH, 1-10C alkyl groups, glycol esters, anhydride groups, and/or -COOM.    At least three of R1-R4 contain the group -COOM; or at least 2 of R1-R4 contain an anhydride group, and at least 1 of R1-R4 contain the group -COOM.    INDEPENDENT CLAIMS are also included for:    (1) inhibiting corrosion in brazed metal surface in connection with coolant comprising contacting brazed metal surface with the above coolant; and    (2) cooling system resistant to corrosion comprising cooling system component(s) containing brazed metal surface, and a coolant in communication with the brazed metal surface aluminum surface.