Following a turbocharger failure, what is the recommended CAC service?

• A. CAC should always be replaced
• B. CAC should be removed and back-flushed with solvent
• C. CAC should be ignored
• D. CAC should be left in place

Answer: (B)

When a turbocharger fails, oil and debris can contaminate the charge-air path and clog the charge air cooler (CAC). The goal is to remove these contaminants so clean air can flow again and prevent engine damage from contaminated charge air.

Removing the CAC and back-flushing it with an approved solvent is the best approach because it allows thorough cleaning of all passages and the core. Back-flushing pushes oil, sludge, and carbon out of the unit in the opposite flow direction, ensuring contaminants aren’t left behind in tight passages or on internal surfaces. After cleaning, inspect for any damage or contamination beyond salvage, replace if needed, and reinstall with fresh seals and hoses to restore proper cooling and airflow.

Choosing to leave the CAC in place would risk trapping oil and debris inside, which can continue to enter the intake and cause problems. Simply ignoring the issue isn’t acceptable, and while replacement may sometimes be necessary, cleaning and back-flushing is the recommended first service to restore function after a turbo failure.