Vehicle air-conditioning system

An air conditioning system for a vehicle comprising:

• an air-conditioning case defining a cold air passageway and a warm air passageway;
• the air-conditioning case further having an outer face defining a cold air discharge port into the cold air passageway and fluidly connected to an outside of the vehicle, and a warm air discharge port into the warm air passageway and fluidly connected to the outside of the vehicle;
• the air-conditioning case further including a distribution duct fluidly connected to the cold and warm air passageways and an interior of the vehicle;
• a cold air mode door connected to the air-conditioning case and moveable between a first position and a second position, wherein in the first position the cold air mode door prevents air from flowing from the cold air passageway to the cold air discharge port and allows air to flow from the cold air passageway to the distribution duct, and wherein in the second position the cold air mode door allows air to flow from the cold air passageway through the cold air discharge port and prevents air from flowing from the cold air passageway to the distribution duct;
• and
• a warm air mode door connected to the air-conditioning case and moveable between a first position and a second position, wherein in the first position the warm air mode door prevents air from flowing from the warm air passageway to the warm air discharge port and allows air to flow from the warm air passageway to the distribution duct, and wherein in the second position the warm air mode door allows air to flow from the warm air passageway through the warm air discharge port and prevents air from flowing from the warm air passageway to the distribution duct;
• at least one a cover plate connected to the outer face of the air-conditioning case outside of the air conditioning case and overlying the cold air discharge port and the warm air discharge port for preventing outdoor air from flowing backward through the cold air discharge port and the warm air discharge port.