Overheating can be caused by all of the following EXCEPT:

• A. Low coolant level
• B. Defective condenser
• C. Faulty thermostat
• D. Clogged radiator

Answer: (B)

Overheating happens when the engine cooling system can’t remove heat effectively. The cooling circuit relies on adequate coolant to absorb heat, a thermostat that allows coolant to flow when needed, and a radiator that can transfer that heat to the air. If the coolant level is too low, there isn’t enough fluid to carry heat away. If the thermostat sticks closed, coolant stays trapped in the engine and the heat builds up. If the radiator is clogged, heat isn’t transferred to the air efficiently, so the engine runs hotter.

The condenser, on the other hand, is part of the air conditioning system, not the engine’s cooling loop. Its job is to reject heat from the refrigerant in the AC system, not to remove heat from the engine. A faulty condenser won’t directly cause the engine to overheat; it mainly affects AC performance. That’s why it is the option that does not cause overheating, while the other issues can.