Abstract: A rib is provided around a hose connecting portion which is projected from an upper tank of a radiator. A cooling water which is leaked from a fitting portion between a hose and a hose connecting portion is guided to a predetermined position by the rib. As a result, such an event can be eliminated that the leakage cooling water drops downward and then attaches to a caulking portion between the upper tank and a core portion and thus such water is misconceived for a leakage water generated from the caulking portion.

Abstract: A collar member disposed about a drain bore in the radiator. A drain cock is received within the collar member and has a portion which enters the drain hose is fixed to a drain bore of the radiator and seals the drain bore when tightened. An axial groove in the drain cock places the interior of the radiator in communication with a chamber within the collar when the drain cock is loosened, so that fluid may be drained from the radiator through the chamber and the drain hose. A hose holder is connected to a fan shroud to hold a portion of the drain hose in place.

Abstract: A coolant reserve tank comprises a disk-shaped splash-guard member horizontally disposed adjacent an inner end of a coolant reserve chamber vent and having in the upper surface thereof a plurality of grooves only through which the vent opens into the coolant reserve chamber, whereby the waves of the coolant in the chamber are mostly dashed against the lower surface of the splash-guard member and prevented from dashing into the vent to leak out therethrough.

Abstract: In a control system for an air conditioner of a motor vehicle, which includes an automatic control circuit arrangement for controlling the air conditioner to enable it to operate at a desired level of the heating or cooling performance thereof, there is provided an emergency circuit arrangement which is adapted, in case the automatic control circuit arrangement fails to work properly, for example, to cause it to be disconnected from the air conditioner and enable the latter to operate only at the maximum level of the heating or cooling performance thereof. There is also provided a switch device which is connected to selectively render operative a desired one of the above two circuit arrangements, and provided with means for preventing the emergency circuit from being unintentionally rendered operative.