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For many different reasons there is a great potential for a system capable of storing and using waste motor heat of cars to provide heating or cooling. If such a system has a high storage density application in electrical and hybrid vehicles may be interesting. The SWEAT system, in which SWEAT stands for Salt Water Energy Accumulation and Transformation, has led to a new heat storage and cooling system for automotive applications. The system can best be discribed as a thermochemical heat storage system which stores low temperature heat for instance waste heat from car motors. At a later stage heat or cold can be produced by using the thermochemical heat pump function. The basic problems with comparable systems in the past were: Poor stability and side reactions of the materials used.