A loader operator reports that the engine temperature gauge is consistently running at the higher end of the normal operating range, especially when performing heavy digging tasks. The coolant level has been checked and is full. What is a common next diagnostic step for this symptom?

Question: A loader operator reports that the engine temperature gauge is consistently running at the higher end of the normal operating range, especially when performing heavy digging tasks. The coolant level has been checked and is full. What is a common next diagnostic step for this symptom?

Answer options:

• Replace the thermostat. ✅ Check for debris or blockage in the radiator fins.
• Increase the engine idle speed.
• Drain and refill the fuel tank with a different type of fuel.

Correct answer: Check for debris or blockage in the radiator fins.

Explanation: Overheating, even if the coolant level is full, often points to insufficient heat dissipation. A common cause for this is a blocked radiator, which restricts airflow and prevents the coolant from cooling effectively. Replacing the thermostat might be a solution, but checking for obvious blockages is a simpler, more common first diagnostic step. The other options are unrelated or detrimental.