external leads of an output of a pump volute of a coolant in a heat engine of a vehicle

The invention relates to an external duct (1) with an outlet (4) of a volute (3) of a coolant pump (2), in particular arranged in a housing defined in a thermal engine of a vehicle, outer conduit (1) being on an outer face (9) of a cylinder block (8) of the engine and includes a first component (5a) capable of guiding the coolant from said outlet fluid (4) to an input (6 ) of an internal circuit (7) for circulating the heat transfer fluid defined in the cylinder block (8).