An increase in engine cooling and water temperature indicates which of the following?

• A. Overheating due to engine friction
• B. A lack of engine cooling
• C. Normal operation
• D. Low coolant

Answer: (B)

Heat must be removed from the engine by the cooling system. When cooling is not sufficient, heat builds up in the coolant and the engine, causing both coolant temperature and engine temperature to rise. So a rise in both indicates the system isn’t removing heat effectively, i.e., a lack of engine cooling. In normal operation, the cooling system keeps temperatures within a safe range, not steadily increasing. Low coolant is a possible cause of reduced cooling, but the symptom described points to the broader cooling deficit rather than a simple low level alone.