Heater/cooler module, integrated into an intake manifold of an internal combustion engine for conditioning a gaseous intake fluid

An intake system for a turbocharged internal combustion engine, comprising an intake manifold (13) defining a plenum chamber (15) connectable to a plurality of engine cylinders (11), an intake duct (17) opening into the plenum chamber (15) and supplying a gaseous fluid thereto, an electric heater (20) provided for heating the gaseous fluid, and a cooler (30) supplied with a cooling fluid, provided for cooling the gaseous fluid. The heater and the cooler cooperate to form a conditioning module (40) positioned within the plenum chamber (15) in such a way as to intercept at least a substantial part of the gaseous fluid entering the plenum chamber (15) from the intake duct (17), wherein the cooler (30) is arranged in series with the heater (20).