Vehicle heating and air conditioning modules

A heating, ventilation and air conditioning system for a vehicle having a passenger compartment, an adjacent engine compartment and a dash panel separating the passenger compartment from the engine compartment, comprising:

• an engine compartment module having a base formed for positioning on at least two locations on a dash panel, a outside air inlet, a secondary air inlet for communication with the passenger compartment, an air outlet and defining an air transport conduit connecting the outside air inlet or the secondary air inlet with the air outlet;
• a passenger compartment module having a slide in slot for a heater core, an inlet for communication with the air outlet from the engine compartment module, an air manifold, a panel exhaust from the air manifold, a defrost exhaust from the air manifold, a compartment door providing access to the slide in slot, and an air channel from the inlet to the air manifold;
• a heater core retained in the slide in slot;
• a temperature blend door positioned in the air channel on a pivoting mount allowing movement of the temperature blend door to various positions controlling the proportion of air flow through the air channel diverted through the heater core;
• a pulse count actuator coupled to the temperature blend door for positioning the temperature blend door;
• a vent door mounted on a pivoting mount and positionable in the air manifold for diverting air flow through the panel exhaust;
• a defrost door mounted on a pivoting mount and positionable in the air manifold for diverting air flow through the defrost exhaust;
• and
• a kinematic movement comprising drive gears for the pivoting mounts for the vent door and the defrost door, and a pulse count actuator coupled to the drive gears for controlling the positioning of the vent door and the defrost door.