Air intake manifold comprising a heat exchanger that is entirely integrated within its body, said heat exchanger being arranged entirely in the hollow body of said manifold and comprising at least two pipes (4 and 4') for the inflow and outflow of heat exchange liquid, said pipes (4, 4') extending through the wall of the body of the manifold, each of the pipes having a seal with respect to liquid and a seal with respect to air, these being distinct and set apart from one another along the longitudinal axis of the pipe (4, 4') in question, in which manifold a means establishing the seal with respect to liquid is, for each of the pipes (4 and 4'), arranged between the pipe (4, 4') and a circulation duct (7, 7') that is attached and connected directly to the free end (4") of this pipe (4, 4'), in which a means establishing the seal with respect to air is positioned between the pipe (4, 4') and the body of the manifold, the seal with respect to liquid being located, relative to the internal volume of the body of the manifold, beyond the seal with respect to air, that is to say further out than the latter, and in which a leakage path associated with the seal with respect to liquid and configured to evacuate leaks of liquid to the outside environment, is provided between this seal with respect to liquid and the seal with respect to air, in which manifold each pipe (4, 4') forms by cooperation with, on one hand, the associated circulation duct (7, 7') and, on the other hand, the body of the manifold, in each case a recess (11, 12) for receiving while compressing the sealing means (5', 6') in question, the leakage path comprising, at its upstream end, a drainage opening for the recess receiving the means for sealing with respect to liquid, said opening discharging to the outside environment via the leakage path and being located beyond the sealed barrier provided by the means for sealing with respect to liquid, on the side outside of said barrier, manifold characterized in that a through-opening (3") for the at least two pipes (4, 4') at the body of the manifold is provided with an L-section collar, defining in head-to-tail cooperation with a shoulder of the pipe (4, 4'), in that the annular recess for receiving the seal with respect to air and the end sleeve (7") of the circulation duct (7, 7") extends above the edge of the free end (4") of the pipe (4, 4') and at least partially above the collar of the through-opening (3") of the body of the manifold, delimiting with said pipe (7, 7") and said collar the recess for receiving the seal with respect to liquid and in that the two circulation ducts (7 and 7') with their respective end sleeves (7") form a single, integral part, this part (7, 7', 7") being locked in place on the body of the manifold, for example by means of a screw-fitting fastener that engages in said body. in which manifold a means establishing the seal with respect to liquid is, for each of the pipes (4 and 4'), arranged between the pipe (4, 4') and a circulation duct (7, 7') that is attached and connected directly to the free end (4") of this pipe (4, 4'), in which a means establishing the seal with respect to air is positioned between the pipe (4, 4') and the body of the manifold, the seal with respect to liquid being located, relative to the internal volume of the body of the manifold, beyond the seal with respect to air, that is to say further out than the latter, and in which a leakage path associated with the seal with respect to liquid and configured to evacuate leaks of liquid to the outside environment, is provided between this seal with respect to liquid and the seal with respect to air, in which manifold each pipe (4, 4') forms by cooperation with, on one hand, the associated circulation duct (7, 7') and, on the other hand, the body of the manifold, in each case a recess (11, 12) for receiving while compressing the sealing means (5', 6') in question, the leakage path comprising, at its upstream end, a drainage opening for the recess receiving the means for sealing with respect to liquid, said opening discharging to the outside environment via the leakage path and being located beyond the sealed barrier provided by the means for sealing with respect to liquid, on the side outside of said barrier, manifold characterized in that a through-opening (3") for the at least two pipes (4, 4') at the body of the manifold is provided with an L-section collar, defining in head-to-tail cooperation with a shoulder of the pipe (4, 4'), in that the annular recess for receiving the seal with respect to air and the end sleeve (7") of the circulation duct (7, 7") extends above the edge of the free end (4") of the pipe (4, 4') and at least partially above the collar of the through-opening (3") of the body of the manifold, delimiting with said pipe (7, 7") and said collar the recess for receiving the seal with respect to liquid and in that the two circulation ducts (7 and 7') with their respective end sleeves (7") form a single, integral part, this part (7, 7', 7") being locked in place on the body of the manifold, for example by means of a screw-fitting fastener that engages in said body.