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The use of copper heat exchangers was the major trend in large transportation vehicles due to their satisfactory performance in severe conditions. However, heat exchangers made of aluminum for the heat exchanger part and glass-fiber reinforced modified polyamide resin for the coolant tank have been developed due to the demand for weight and cost reduction as well as productivity improvement. In the injection molding of these large tanks, warping is an engineering concern. Therefore, by analyzing the warping with the use of injection molding simulations, we have developed a production method that is capable of satisfying the dimensional requirements without any dimension correcting process.