Hvac air valve

An HVAC module comprising:

• a housing having a main air supply passage, a first outlet passage, a first conditioning passage extending between the main air supply passage and the first outlet passage, a second outlet passage, a second conditioning passage extending between the main air supply passage and the second outlet passage, at least one first outlet communicating the first outlet passage for directing a first conditioned flow of air to a first location, and at least one second outlet communicating with the second outlet passage for directing a second conditioned flow of air to a second location different that the first location;
• a blower operable to supply an air flow through the housing;
• a heater core disposed in the housing and extending through both of the first and second conditioning passages;
• a first actively controlled door operable to selectively block flow communication between the main air supply passage and the first conditioning passage;
• a second actively controlled door operable to selectively block flow communication between the main air supply passage and the second conditioning passage;
• and
• a passive air valve disposed in the second conditioning passage on an opposite side of the heater core from the second door, the air valve allowing air to flow through the heater core in the second conditioning passage when originating from the main air supply passage and inhibiting air flow through the second conditioning passage when originating from the second outlet passage, the air valve thereby inhibiting back airflow from the second conditioning passage to the first conditioning passage when the first and second doors block flow communication between the respective first and second conditioning passages and the main air supply passage.