An EGR cooler comprises a cooling core having a plurality of passages for accommodating
the flow of exhaust gas therethrough, an exhaust gas inlet chamber connected to
the cooling core, for receiving exhaust gas from an internal combustion engine
and passing the exhaust gas to the cooling core, and an exhaust gas outlet chamber
separate from the exhaust gas inlet chamber and connected to the cooling core for
receiving exhaust gas from the core. The cooler further includes means for permitting
the controlled passage of exhaust gas from the exhaust gas inlet chamber to the
exhaust gas outlet chamber without passing through the cooling core, said means
being positioned upstream from the exhaust gas outlet chamber. Configured in this
manner, the EGR cooler permits the mixing of cooled exhaust gas with uncooled exhaust
to provide a desired exiting gas temperature that is below an exhaust gas dew point.