What is the function of the diverter valve in the air conditioning system?

• A. Block air to selected compartments
• B. Provide a limited supply of air to all compartments if one unit fails
• C. Increase airflow to the primary compartment
• D. Filter air before distribution

Answer: (B)

The diverter valve controls how conditioned air from the system is distributed among cabin compartments. Its key role is to keep the airflow going to all areas even if one air conditioning unit fails, by providing a limited supply of air to every compartment instead of cutting off air entirely to some zones. In other words, it redirects the available air so all areas receive at least a small amount of conditioned air during a failure, rather than concentrating it in one primary zone. It isn’t responsible for blocking air to certain areas, boosting airflow to a single compartment, or filtering air—those functions are handled by different components.