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Automobile coolant pump failures can be minimized by choosing an engine coolant formulation that has a relatively insignificant effect on the seal as well as the other materials used in the construction of the pumps. A fleet test involving 203 1990 Ford Crown Victoria taxi cabs provided data demonstrating that the number of pump failures experienced by the group of taxis employing a unique experimental coolant free of most traditional corrosion inhibitors was much lower than the number experienced by any of the other four test groups employing different, more traditional, formulation variations.
Sixty to eighty-five percent of the original equipment coolant pumps on the four groups of vehicles employing the more traditional coolant formulations had to be replaced during the test period, which nominally covered the vehicles' first 160 000 km. Only 15% of the original coolant pumps installed on the experimental coolant test group required replacement.
coolant pump, engine coolant formulation, fleet test, corrosion inhibitor, silicate, carboxylic acid, long-life coolant, heavy-duty coolant, universal coolant, notched box, whisker plot
Senior engineer, Texaco Chemical Company, Austin Research Laboratories, Austin, TX