Abstract: In a compressor protective switch system for the refrigerant compressor of the refrigeration system of an automotive air conditioner, a pressure sensitive switch adapted to be open in response to a refrigerant pressure lower than a relatively high predetermined value is paralleled by a positive temperature coefficient (PTC) resistance element or a series combination of a PTC resistance element and an atmospheric temperature sensitive switch adapted to be open in response to an atmospheric temperature lower than a predetermined value.

Abstract: A refrigerant evaporator for use in, for example, an air conditioning system including a fan, blower or the like adapted to establish a flow of air through the evaporator comprises a serpentine-anfractuous evaporator tube and fins attached to the external surfaces of the tube and is characterized by the provision of a ridge wall secured to or integral with a leeward end wall of the evaporator tube and configured to form grooves to collect therein the drops of water condensate which are produced on the surfaces of the tube and fins and which are forced to flow on these surfaces toward the leeward end of the evaporator under the influence of the flow of air through the evaporator.

Abstract: A protection device for a vehicle-mounted air conditioner compressor wherein an electric current for engaging the electro-magnetic clutch of the air conditioner compressor is also fed through a PTC ceramic resistor disposed between a starter contact of the ignition switch and a terminal of the electro-magnetic clutch during the starting operation of an engine in addition to an operation of the conventional circuit including a compressor relay and a compressor switch.

Abstract: Hereindisclosed is an airflow distributing device which comprises a main duct in which air heating means and air cooling means are disposed; a casing located at a downstream end of the main duct and having therein three cells which are respectively communicated with selected portions of the passenger compartment through respective transmitting ducts, the casing being arranged to allow respective openings of the cells to face toward the chamber defined by the main duct; and a mode plate having a size to sufficiently cover the openings of the cells and having an opening therein, the mode plate being rotatably fixed at its center portion to the casing such that the opening thereof is able to open to at least selected one of the openings of the cells upon rotation thereof.