A truck's heater produces inadequate heat. Which of these is the most likely cause?

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Multiple choice — select the best answer

AA faulty blower motor
BA properly functioning thermostat
CAn overcharged cooling system
DAir in the cooling system

✓ Correct answer: D. Air in the cooling system Air trapped in the cooling system prevents proper coolant circulation through the heater core, resulting in inadequate heat output. Bleeding the air from the cooling system would restore proper flow and heat transfer.

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A truck's heater produces inadequate heat. Which of these is the most likely cause?

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