When the engine is not running, what is the state of the blend door?

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Prepare for the California BAR Smog Technician Test. Review key topics with flashcards and multiple choice questions, each question includes hints and explanations. Get ready to ace your exam!

Multiple Choice

When the engine is not running, what is the state of the blend door?

Explanation:
When the engine isn’t running, the heater core cannot provide heat because the coolant isn’t circulating. The blend door’s job is to mix heated air from the heater core with cold outside air to control cabin temperature. With no heat available, the system can only deliver unheated air, so the blend door sits in cold air mode. The other options would require heat (hot air mode), block airflow entirely (closing the door), or rely on automatic control that needs power and a heat source, which isn’t available when the engine is off.

When the engine isn’t running, the heater core cannot provide heat because the coolant isn’t circulating. The blend door’s job is to mix heated air from the heater core with cold outside air to control cabin temperature. With no heat available, the system can only deliver unheated air, so the blend door sits in cold air mode. The other options would require heat (hot air mode), block airflow entirely (closing the door), or rely on automatic control that needs power and a heat source, which isn’t available when the engine is off.

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