A truck engine has normal operating temperature but the coolant recovery reservoir is constantly overflowing. The most likely cause is:

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Multiple choice — select the best answer

AStuck-open thermostat
BAir trapped in the cooling system
CFaulty radiator cap
DOvercharged cooling system

✓ Correct answer: C. Faulty radiator cap A faulty radiator cap that doesn't maintain proper system pressure will allow coolant to escape to the recovery reservoir. This happens even at normal operating temperatures if the cap isn't sealing correctly.

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A truck engine has normal operating temperature but the coolant recovery reservoir is constantly overflowing. The most likely cause is:

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