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A rough estimate of the energy components in internal combustion engines for motor vehicles indicates that the total fuel energy is converted to one-third each into mechanical energy, engine coolant heat and exhaust energy. This large share of waste heat in the exhaust motivates various attempts to recover the remaining exergy in the exhaust. Intensifying charge air cooling by an exhaust-heat-driven cooling system provides a promising approach to engine waste heat recovery. The exhaust energy is most suitable for this recovery effort due to its higher temperature level in comparison to engine coolant. A further decreasing of charge air temperature provides an additional degree of freedom, which expands the boundaries concerning engine application.