6.7L Cummins Air Intake System – Charge-Air Cooler – Initial Check

Inspect the charge air cooler for cracks, holes, and other damage.
Inspect the tubes, fins, and welds for tears, breaks, or other damage.
If any damage causes the charge air cooler to fail the air leak check, the charge air cooler must be replaced.
Inspect the charge air cooler plumbing for cracks and other damage.