Which technician’s statement about coolant passageways through the turbocharger housing is considered correct?

• A. Technician A
• B. Technician B
• C. Both Technicians
• D. Neither Technician

Answer: (B)

Coolant passages are built to run through the center housing around the bearing cartridge. The purpose is to remove heat from the bearings and seals, so coolant flows from the engine into the center of the turbo, circulating around the bearing area, and then back out to the engine. The turbine and compressor housings aren’t designed to carry this coolant; they’re kept dry and cooled by other means. So the statement that describes coolant flowing through the center housing to cool the bearings (and returning to the engine) matches how water-cooled turbochargers are designed to operate.