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When designing components, systems and fluid characteristics, thermal loads gathered over the life cycle of an automobile are of great interest. Ageing and deterioration based on the temperature/time distribution that a component or fluid is exposed to, affects the functionality and/or durability of electronics, polymers and lubricants. Optimal design in terms of quality and cost are two of the most governing parameters at Volvo Cars at present. To meet this need, designing terms of life cycles from a thermal perspective has been developed during recent years. This paper presents a methodology for designing components and choosing system solutions from life span thermal loads in Volvo Car's vehicles. The fundamental ideas behind the method, design criteria and examples of usage are discussed from a holistic point of view.