A diesel truck equipped with a JWAC (Jacket Water Aftercooler) has low power under load. Which of the following could be the cause?

The ASE identifies Electronic Diesel Engine Diagnosis Specialist as an individual service area (L2). The electronic diesel engine diagnosis area involves the following components:
- General Inspection and Diagnosis
- Electronic Engine Controls Diagnosis
- Air Exhaust Systems Diagnosis
- Fuel Systems Diagnosis
- Emission Systems Diagnosis.