The internal space of a package is divided by a midlevel wall into a top compartment and a bottom compartment. The top compartment is further divided to provide a radiator chamber that accommodates a radiator and a radiator fan. The midlevel wall has a spatial connection port that spatially connects the radiator chamber and the bottom compartment. There is provided a spatial connection port cover that hangs over the spatial connection port, but that is open sideways. The radiator is disposed to face the radiator fan from below. The radiator has one of sides (e.g., a left frame portion) thereof supported by a spatial connection port cover.