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    An Evaluation of Engine Coolant Recycling Processes: Part I

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    The Service Technology Group (STG) is an organization within General Motors (GM) responsible for providing service equipment and information to GM dealerships. STG is charged not just with the responsibility for current GM vehicles, but for the cars and trucks of the future as well. The tools, the procedures and the programs that technicians will use tomorrow must be created and validated today. Various staffs within STG address advanced serviceability readiness, special tool development, service research, and similar themes.

    As the awareness of environmental issues has heightened, the disposition of spent engine coolant has begun to affect automotive service. One possible approach to this coolant disposition problem is that of coolant recycling. General Motors Service Technology Group has conducted a study in which the objective was to determine the efficacy of (state of the art) engine coolant recycling. Spent engine coolant was collected from vehicles and combined to form a reference coolant with a mean age of approximately seven years. Various coolant recycling processes were evaluated as they were required to process the reference coolant. Once the recycled samples were obtained, they were sent to an independent test facility. The test criteria was GM 1825M, a virgin coolant corporate specification.

    Included in this study was the evaluation of off-site coolant recycling facilities that reformulate engine coolant for reuse.

    In advancing its pro-active environmental policy, STG has initiated this study to evaluate the efficacy of engine coolant recycling. It is our belief that the results of this undertaking will be beneficial to our dealers, the environment, and our customers.


    corrosion, inhibitors, recycling, inhibitors, reference coolant, deionization, filtration, centrifugation, flocculation, coagulation, reverse osmosis, vacuum distillation, coolant extension

    Author Information:

    Bradley, WH
    Senior project engineer, General Motors Service Technology Group, Warren, MI

    Committee/Subcommittee: D15.15

    DOI: 10.1520/STP25173S