Vehicular air temperature control system having excellent windshield defogging characteristics

A vehicular air temperature control system for heating a passenger compartment of a vehicle by blowing air from a plurality of air outlets in said passenger compartment that includes a defogging air outlet that is directed towards a windshield of said vehicle, a lower region air outlet that is directed towards a lower region of said passenger compartment and an upper region air outlet that is directed towards an upper region of said passenger compartment, said control system:

• a heat pump cycle which includes a condenser;
• a case which is for accommodating said condenser which defines a first passage and a second passage parallel to said first passage, said first passage being for guiding air towards said plurality of air outlets while passing through said condenser so that air is heated by said condenser, said second passage being for guiding air towards said plurality of air outlets while bypassing said condenser;
• physical value detection means for detecting a physical value indicative of a surface temperature of said windshield of said vehicle;
• a blower, which is coupled to said case, for blowing air towards said case;
• air type switching means for selecting said air to be blown by said blower to said housing condenser to be one of outside air that is outside of said vehicle, and inside air, that is inside said vehicle, said air type switching means being for selecting outside air when said physical value detected by said physical value detection means is lower than said predetermined value;
• condenser door switching means disposed inside said case for selectively opening and closing said first passage and said second passage, said condenser door switching means being for closing said first passage and for opening said second passage when said physical value detected by said physical value detection means is lower than said predetermined value so that said outside air bypasses said condenser;
• and
• air outlet switching means for selectively opening and closing said defogging air outlet, said lower region air outlet and said upper region air outlet, said air outlet switching means being for opening said defogging air outlet to direct said outside air towards an inner surface of said windshield when said physical value detected by said physical value detection means is lower than a predetermined value to form a low humidity air curtain for preventing fogging in said windshield.