Abstract: There is provided an automotive air conditioning system comprising a primary blower disposed at a front part of a vehicle having a passenger compartment constituted by a front-seat side space and a rear-seat side space, a case disposed in the front part of the vehicle in such a manner that air is caused to flow from one end to the other end thereof by means of the primary blower and having a lower opening which is opened therein at a lower portion at the other end thereof, a heat exchanger disposed within the case, a scroll case disposed below the case and having opened therein an outlet and an inlet connecting to the lower opening, an centrifugal fan accommodated in the scroll case and having a rotating shaft which is oriented in a substantially vertical direction, a secondary blower having driving means for driving the centrifugal fan, and a rear seat duct connected to the outlet and communicating with the rear-seat side space.

Abstract: An air conditioning apparatus includes a seal wall having a seal surface to which one end surface of an air mixing door is contacted in the maximum heating state. A defroster warm air leading passage is constructed by the seal wall, a warm air guide portion and an inner surface of an air conditioning case. The defroster warm air leading passage is formed in a space opposite to the seal surface of the seal wall at a downstream air side of the seal wall. Because cool air hardly flows through the space opposite to the seal surface of the seal wall and the defroster warm air leading passage is formed by effectively using the space, the size of the air conditioning apparatus for a vehicle can be reduced.

Abstract: The radiator comprises a radiator cap for closing a cooling medium supply port, valve means for permitting the interior of a radiator body to communicate with the open air, locking means operatively associated with the valve means and for locking the radiator cap to the radiator body, and a key for actuating the locking means, whereby the valve means is opened simultaneously with the time when the locking means has been unlocked by the key.