Engine assembly in compartment

An engine assembly comprising an engine compartment having an inlet and an outlet and an internal combustion engine received in the engine compartment, the engine compartment fluidly connected to an environment thereof through the inlet, the engine assembly further including a heat exchanger extending over the inlet and defining a portion of a wall of the engine compartment, the heat exchanger having a first conduit fluidly connected to a fluid circuitry of the internal combustion engine and a second conduit fluidly connected to the environment via the inlet and fluidly connected to an interior of the engine compartment, the first and second conduits being in heat exchange relationship with each other, the engine assembly including a forced air system operable in use to provide an air flow from the environment to the outlet via the second conduit and the engine compartment, the engine assembly having a selector valve configurable to selectively fluidly connect an air intake of the internal combustion engine with the engine compartment in a first valve position and with the environment in a second valve position.