While performing a cooling system pressure test, the pressure drops steadily with no visible external leaks. This could indicate:

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Multiple choice — select the best answer

AAn internal cooling system leak
BA faulty pressure tester
CNormal system operation
DAn overcharged cooling system

✓ Correct answer: A. An internal cooling system leak If pressure drops during a cooling system test without visible external leaks, an internal leak such as a head gasket leak is likely allowing coolant to enter the combustion chamber or oil passages.

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While performing a cooling system pressure test, the pressure drops steadily with no visible external leaks. This could indicate:

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