Independent defroster outlet temperature and air flow control system

An HVAC system for an automotive vehicle comprising:

• an evaporator for providing cold air;
• a heater core for providing hot air;
• a heater airflow path to direct an airflow through a heater air outlet;
• a heater damper door to control a volume of the airflow through the heater air outlet;
• a defroster airflow path to direct an airflow through a defroster air outlet;
• a defroster damper door to control a volume of the airflow through the defroster air outlet;
• a separation channel that is disposed downstream from the heater core, forms part of the heater airflow path by communicating airflow to the heater air outlet, and crosses the defroster airflow path, wherein the separation channel prevents the airflow of the heater airflow path from mixing with the airflow of the defroster airflow path at a position at which the separation channel is located;
• a bypass door disposed downstream from the heater core and upstream from the defroster damper door at an entrance of the defroster airflow path, the bypass door controls a volume of hot air that flows from the heater core directly into the defroster airflow path so as to control a temperature of the airflow through the defroster air outlet without disrupting a temperature of the airflow through the heater core and in the heater airflow path;
• and
• a mixing chamber, wherein hot air from the heater core flows into the mixing chamber independent of a position of the bypass door, wherein the cold air from the evaporator and the hot air from the heater core form mixed air in the mixing chamber, and wherein the hot aft controlled by the bypass door flows directly from the heater core into the defroster airflow path and bypasses the mixing chamber so as to pass through into defroster airflow path without mixing with the cold aft from the evaporator,
• wherein the defroster damper door is configured to operate independently from the heater damper door.