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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

An engine is experiencing consistent overheating after a radiator replacement. The cooling system was properly bled. What diagnostic step should be prioritized next?

After bleeding the system, a common cause of overheating post-radiator replacement is a faulty or improperly installed thermostat, which regulates coolant flow.

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Question: An engine is experiencing consistent overheating after a radiator replacement. The cooling system was properly bled. What diagnostic step should be prioritized next?

Answer options: ✅ Check for correct thermostat operation and installation.

  • Replace the engine oil.
  • Inspect the air filter.
  • Measure the tire pressure.

Correct answer: Check for correct thermostat operation and installation.

Explanation: After bleeding the system, a common cause of overheating post-radiator replacement is a faulty or improperly installed thermostat, which regulates coolant flow.

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