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An HVAC system for a vehicle includes a housing, a front HVAC unit housed in the housing and having a front blower, a first airflow path, and a front air mix door, a rear HVAC unit housed in the housing and having a rear blower, a second airflow path, and a rear air mix door. The HVAC system further

An HVAC system for a vehicle includes a housing, a front HVAC unit housed in the housing and having a front blower, a first airflow path, and a front air mix door, a rear HVAC unit housed in the housing and having a rear blower, a second airflow path, and a rear air mix door. The HVAC system further includes an evaporator having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path, and a heating core having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path. An airflow directional door is disposed between the first airflow path and the second airflow path to regulate airflow from the rear blower to the first airflow path.

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1. An HVAC system for a vehicle comprising: a housing;a front HVAC unit housed in the housing and having a front blower, a first airflow path, and a front air mix door, the first airflow path defined from the front blower to a front air outlet;a rear HVAC unit housed in the housing and having a rear

1. An HVAC system for a vehicle comprising: a housing;a front HVAC unit housed in the housing and having a front blower, a first airflow path, and a front air mix door, the first airflow path defined from the front blower to a front air outlet;a rear HVAC unit housed in the housing and having a rear blower, a second airflow path, and a rear air mix door, the second airflow path defined from the rear blower to a rear air outlet;an evaporator having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path, the evaporator being oriented substantially vertical;a heating core having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path; anda lone airflow directional door disposed between the first airflow path and the second airflow path at a lone communication channel therebetween to regulate airflow from the rear blower to the first airflow path, wherein the first and second airflow paths are segregated from one another at all positions along the first and second airflow paths other than the lone communication channel, the lone airflow directional door is disposed upstream from the heater core and is rotatable between a first position and a second position to selectively open and close the lone communication channel between the segregated first and second airflow paths,whereinwhen the airflow directional door is in the first position, the lone communication channel is closed such that communication between the first and second airflow paths is blocked and the airflow from the rear blower is directed through the second airflow path, andwhen the airflow directional door is in the second position, the lone communication channel is open such that the first and second airflow paths communicate via the lone communication channel, the airflow from the rear blower is directed to the first airflow path, and the airflow directional door is positioned to block the second airflow path so as to prevent the airflow from the rear blower from flowing through the second airflow path past the airflow directional door. 2. The HVAC system of claim 1, wherein the airflow directional door is operable to be held in any position between the first position and the second position thereby allowing the rear blower to direct airflow to both the first airflow path and the second airflow path simultaneously. 3. The HVAC system of claim 2, wherein the airflow directional door is disposed downstream from the evaporator. 4. The HVAC system of claim 1, wherein the front HVAC unit further includes a bypass door movable between a first position and a second position, and wherein when the bypass door is in the second position a portion of airflow from the first portion of the evaporator bypasses the first airflow path and is directed directly to a front outlet such that a temperature of the airflow exiting the front outlet can be regulated independently of a position of the front air mix door. 5. The HVAC system of claim 1, wherein the front HVAC unit further includes a defroster communicating with a defroster outlet, a defroster outlet divider disposed in a middle of the defroster outlet thereby forming a first defroster outlet and a second defroster outlet, and a defroster outlet door having an air deflection bracket extending from a top of the defroster outlet door, and the defroster outlet door is movable between a first position, a second position, and a third position. 6. The HVAC system of claim 5, wherein when the defroster outlet door is in the first position the first defroster outlet and the second defroster outlet are closed and airflow in the first airflow path is directed to a vent outlet and/or a heater outlet,when the defroster outlet door is in the second position the first defroster outlet is open and a first airflow is directed to the first defroster outlet, and the air deflection bracket remains in contact with the defroster outlet divider such that the second defroster outlet is closed, andwhen the defroster outlet door is in the third position the first defroster outlet and the second defroster outlet are open and the first airflow is directed to the first defroster outlet and a second airflow is directed to the second defroster outlet. 7. The HVAC system of claim 1 further comprising a drain opening disposed in a bottom of the rear HVAC unit, wherein water condensation generated by both the first portion and the second portion of the evaporator drains out a bottom of the evaporator and exits the HVAC system via the drain opening. 8. An HVAC system for a vehicle comprising: a housing;a front HVAC unit housed in the housing and having a front blower, a first airflow path, a front air mix door, and a first drain opening, the first airflow path defined from the front blower to a front air outlet;a rear HVAC unit housed in the housing and having a rear blower, a second airflow path, a rear air mix door, and a second drain opening, the second airflow path defined from the rear blower to a rear air outlet;an evaporator having a first portion disposed in the first airflow path, a second portion disposed in the second airflow path, and a seal disposed between the evaporator first portion and the evaporator second portion, the evaporator being oriented substantially horizontally, the seal configured to block airflow in the first airflow path from leaking into the second airflow path via the evaporator;a heating core having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path;a lone airflow directional door disposed between the first airflow path and the second airflow path to regulate airflow from the rear blower to the first airflow path;a defroster duct communicating with a defroster outlet, a defroster outlet divider disposed in a middle of the defroster outlet thereby forming a first defroster outlet and a second defroster outlet, and a defroster outlet door having an air deflection bracket extending from a top of the defroster outlet door, the defroster outlet door being movable between a first position, a second position, and a third position,whereinthe first and second airflow paths extend to a position downstream from the heating core and are segregated from one another at all positions along the first and second airflow paths other than a lone communication channel which is selectively opened and closed by the lone airflow directional door. 9. The HVAC system of claim 8, wherein the rear blower is positioned in a center of the HVAC system such that the rear blower extends from an engine compartment towards a vehicle passenger cabin and wherein airflow from the rear blower flows from the vehicle passenger cabin toward a front of the vehicle into the engine compartment and back into the vehicle passenger cabin. 10. The HVAC system of claim 8, wherein the orientation of the evaporator is such that the evaporator slopes downward from the second portion to the first portion. 11. The HVAC system of claim 8, wherein high humidity fresh air from outside the vehicle circulates through the first portion of the evaporator and low humidity re-circulated air from inside the vehicle circulates through the second portion of the evaporator. 12. The HVAC system of claim 8, wherein water condensation generated from the first portion of the evaporator exits the HVAC system via the first drain opening and water condensation generated from the second portion of the evaporator exits the HVAC system via the second drain opening. 13. The HVAC system of claim 8, wherein the airflow directional door being a single door which is rotatable between a first position and a second position, whereinwhen the lone airflow directional door is in the first position, the lone communication channel is closed such that communication between the first and second airflow paths via the lone communication channel is blocked and the airflow from the rear blower is directed to the second airflow path, andwhen the lone airflow directional door is in the second position, the lone communication channel is open such that the first and second airflow paths communicate via the lone communication channel, the airflow from the rear blower is directed to the first airflow path, and the airflow directional door is positioned to block the second airflow path so as to prevent the airflow from the rear blower from flowing through the second airflow path past the airflow directional door. 14. The HVAC system of claim 13, wherein the airflow directional door is operable to be held in any position between the first position and the second position thereby allowing the rear blower to direct airflow to both the first airflow path and the second airflow path simultaneously. 15. The HVAC system of claim 13, wherein the airflow directional door is disposed downstream from the evaporator and upstream from the heater core. 16. The HVAC system of claim 8, wherein the front HVAC unit further includes a bypass door movable between a first position and a second position, and wherein when the bypass door is in the second position a portion of airflow from the first portion of the evaporator bypasses the first airflow path and is directed directly to a front outlet such that a temperature of the airflow exiting the front outlet can be regulated independently of a position of the front air mix door. 17. The HVAC system of claim 8, wherein when the defroster outlet door is in the first position the first defroster outlet and the second defroster outlet are closed and airflow in the first airflow path is directed to a vent outlet and/or a heater outlet,when the defroster outlet door is in the second position the first defroster outlet is open and a first airflow is directed to the first defroster outlet, and the air deflection bracket remains in contact with the defroster outlet divider such that the second defroster outlet is closed, andwhen the defroster outlet door is in the third position the first defroster outlet and the second defroster outlet are open and the first airflow is directed to the first defroster outlet and a second airflow is directed to the second defroster outlet. 18. An HVAC system for a vehicle comprising: a housing;a front HVAC unit housed in the housing and having a front blower, a first airflow path, and a front air mix door, the first airflow path defined from the front blower to a front air outlet;a rear HVAC unit housed in the housing and having a rear blower, a second airflow path, and a rear air mix door, the second airflow path defined from the rear blower to a rear air outlet;an evaporator having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path, the evaporator being oriented substantially vertically;a heating core having a first portion disposed in the first airflow path and a second portion disposed in the second airflow path; anda lone airflow directional door disposed upstream from the heating core and between the first airflow path and the second airflow path at a lone communication channel therebetween to regulate airflow from the rear blower to the first airflow path, wherein the first and second airflow paths extend to a position downstream from the heating core and are segregated from one another at all positions along the first and second airflow paths other than the lone communication channel such that airflow from the front blower does not mix with the airflow from the rear blower within the housing when the lone communication channel is closed by the lone airflow directional door. 19. The HVAC system of claim 18, wherein the airflow directional door is operable to be held in any position between a first position and a second position, the first position being a position at which an opening of the lone communication channel is entirely blocked and the second position being a position at which the opening of the lone communication channel is at a maximum, wherein the lone communication channel is partially opened when the airflow directional door is between the first and second positions thereby allowing the rear blower to direct airflow to both the first airflow path and the second airflow path simultaneously. 20. The HVAC system of claim 18, wherein the front HVAC unit further includes a defroster communicating with a defroster outlet, a defroster outlet divider disposed in a middle of the defroster outlet thereby forming a first defroster outlet and a second defroster outlet, and a defroster outlet door having an air deflection bracket extending from a top of the defroster outlet door, and the defroster outlet door is movable between a first position, a second position, and a third position. 21. The HVAC system of claim 20, wherein when the defroster outlet door is in the first position the first defroster outlet and the second defroster outlet are closed and airflow in the first airflow path is directed to a vent outlet and/or a heater outlet,when the defroster outlet door is in the second position the first defroster outlet is open and a first airflow is directed to the first defroster outlet, and the air deflection bracket remains in contact with the defroster outlet divider such that the second defroster outlet is closed, andwhen the defroster outlet door is in the third position the first defroster outlet and the second defroster outlet are open and the first airflow is directed to the first defroster outlet and a second airflow is directed to the second defroster outlet.