Vehicular air-conditioning unit

A vehicular air-conditioning unit comprising:

• an air-conditioning case;
• a first ventilation passage and a second ventilation passage defined in parallel with each other in the air-conditioning case;
• a first communication-ventilation passage defined in the air-conditioning case, the first communication-ventilation passage through which one end of the first ventilation passage communicates with one end of the second ventilation passage;
• a first heat exchanger that is disposed in the first ventilation passage and heats or cools air flowing in the first ventilation passage between the one end and an other end of the first ventilation passage;
• a second heat exchanger that is disposed in the second ventilation passage and heats or cools air flowing in the second ventilation passage between the one end and an other end of the second ventilation passage;
• and
• a blowing mode switching device setting any one of blowing modes, wherein
• the blowing modes include:
• a first blowing mode (i) in which air is introduced from outside of the air-conditioning case to the one end of the first ventilation passage, the air flows from the one end to the other end of the first ventilation passage, and the air is blown into a vehicle compartment from the other end of the first ventilation passage, and (ii) in which air is introduced from outside of the air-conditioning case to the one end of the second ventilation passage, the air flows from the one end to the other end of the second ventilation passage, and the air is blown into the vehicle compartment from the other end of the second ventilation passage;
• and
• a second blowing mode in which (i) air is introduced from outside of the air-conditioning case to the other end of the first ventilation passage, (ii) the air flows from the other end to the one end of the first ventilation passage and flows to the one end of the second ventilation passage through the first communication-ventilation passage, (iii) the air flowing to the one end of the second ventilation passage flows from the one end of the second ventilation passage to the other end of the second ventilation passage, and (iv) the air is blown from the other end of the second ventilation passage into the vehicle compartment.