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This paper deals with the application of a secondary cooling circuit to a turbocharged engine for a segment C car. The secondary coolant loop, working at low temperature, has been used to cool down the charge air by means of a coolant-to-air exchanger and as hot source of the HVAC circuit by means of a coolant-to-refrigerant condenser. The system is able to ensure both a constant air temperature at engine inlet, with smaller variations for different vehicle working conditions if compared to the normal production equipment, and a lower pressure at the condenser of the HVAC system, thus leading to a reduction in the fuel consumption of the vehicle. Starting from experimental measurements on MVEG cycle, an estimation of the fuel consumption reduction of the system in real use has been done using an LCCP tool FGA did develop and it is here presented.