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A driver complains of constant window fogging in cold weather. Technician A says this could be caused by a clogged heater core. Technician B says it could be caused by a leaking heater core. Who is right?

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✓ Correct answer: C. Both A and B Both technicians are correct. A clogged heater core can reduce heat output needed to clear windows, and a leaking heater core can introduce coolant moisture into the cab, causing window fogging.

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