Abstract:According to the performance characteristics and application requirements of heavyduty engine coolants,the basic liquid,functional additives and complete formulation of the coolant were selected and evaluated by utilizing the fuzzy analytic hierarchy process.With ethylene glycol and propylene glycol as the base fluid,and coupled with a variety of additives,a new heavyduty engine coolant was developed.After physical and chemical analysis and a logistics company car test,it is found the coolant has the characteristics such as good cooling and thermal stability,good performances of anticavitation,antirust,antifoam and antiscaling,a long life of use and storage as well as good stability in composition