A compressor system comprising: a compressor housing; a motor driveshaft rotatably supported within the compressor housing; an impeller connected to the driveshaft and operable to compress incoming refrigerant gas upon rotation of the driveshaft; a bearing housing mounted to the compressor housing and defining a coolant inlet passage and a coolant outlet passage; and first and second foil bearing assemblies (300/300a), each of the first and second foil bearing assemblies comprising: a cylindrical body having an outer surface including a pair of opposed end surfaces and a radial outer surface defining an outer diameter of the cylindrical body, the cylindrical body further having a radial inner surface defining an inner diameter of the cylindrical body, the cylindrical body defining a cooling fluid passage between the radial outer surface and the radial inner surface, wherein the cooling fluid passage extends from an intake port defined in the outer surface to an outlet port defined in the outer surface; and a foil bearing retained within the cylindrical body and in thermal communication with the radial inner surface of the cylindrical body for conductive heat transfer therebetween; wherein each of the first and second foil bearing assemblies is connectable to the bearing housing such that the intake and outlet ports are connected in fluid communication with the coolant inlet passage and coolant outlet passage defined by the bearing housing; and wherein the first foil bearing assembly is interchangeable with the second foil bearing assembly. a compressor housing; a motor driveshaft rotatably supported within the compressor housing; an impeller connected to the driveshaft and operable to compress incoming refrigerant gas upon rotation of the driveshaft; a bearing housing mounted to the compressor housing and defining a coolant inlet passage and a coolant outlet passage; and first and second foil bearing assemblies (300/300a), each of the first and second foil bearing assemblies comprising: a cylindrical body having an outer surface including a pair of opposed end surfaces and a radial outer surface defining an outer diameter of the cylindrical body, the cylindrical body further having a radial inner surface defining an inner diameter of the cylindrical body, the cylindrical body defining a cooling fluid passage between the radial outer surface and the radial inner surface, wherein the cooling fluid passage extends from an intake port defined in the outer surface to an outlet port defined in the outer surface; and a foil bearing retained within the cylindrical body and in thermal communication with the radial inner surface of the cylindrical body for conductive heat transfer therebetween; wherein each of the first and second foil bearing assemblies is connectable to the bearing housing such that the intake and outlet ports are connected in fluid communication with the coolant inlet passage and coolant outlet passage defined by the bearing housing; and a cylindrical body having an outer surface including a pair of opposed end surfaces and a radial outer surface defining an outer diameter of the cylindrical body, the cylindrical body further having a radial inner surface defining an inner diameter of the cylindrical body, the cylindrical body defining a cooling fluid passage between the radial outer surface and the radial inner surface, wherein the cooling fluid passage extends from an intake port defined in the outer surface to an outlet port defined in the outer surface; and a foil bearing retained within the cylindrical body and in thermal communication with the radial inner surface of the cylindrical body for conductive heat transfer therebetween; wherein each of the first and second foil bearing assemblies is connectable to the bearing housing such that the intake and outlet ports are connected in fluid communication with the coolant inlet passage and coolant outlet passage defined by the bearing housing; and wherein the first foil bearing assembly is interchangeable with the second foil bearing assembly.