An apparatus for cooling an axle assembly includes a housing defining a chamber having a first fluid contained therein. The apparatus also includes a conduit located within the chamber. The apparatus further includes a fluid source in fluid communication with the conduit, wherein (1) a second fluid located within the fluid source is advanced through the conduit, and (2) the first fluid located within the housing does not intermix with the second fluid being advanced through the conduit. A method of cooling a differential assembly is also disclosed.