Correct answer
Check the level of the coolant in the expansion tank with the engine cold.
To keep the engine's cooling system in optimum condition, besides replacing the coolant when necessary, the level of this liquid should be checked periodically. This check should be done with the engine cold, and the level should be between the minimum and maximum marks.
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Add ordinary water to keep the level above the maximum.
Check the level of the coolant in the expansion tank with the engine cold.
Check the level of the coolant in the expansion tank with the engine hot.
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