A driver reports that the HVAC system blows only hot air regardless of temperature setting. Technician A says to check the blend door actuator. Technician B says to check the refrigerant level. Who is right?

Question

TheoryPractice · Accepted Answer

Both A and B. Both technicians are correct. The blend door actuator controls airflow through the heater core and evaporator, while insufficient refrigerant would prevent cooling. Both could cause the system to blow only hot air.

A driver reports that the HVAC system blows only hot air regardless of temperature setting. Technician A says to check the blend door actuator. Technician B says to check the refrigerant level. Who is right?

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