Blower and Evaporator

The blower moves the air in the following manner:
^ Across the HVAC module case
^ Through the evaporator

The evaporator dehumidifies the air. The resulting moisture expels through a drain at the front of the dash. The position of the blower speed switch controls the blower speed. A resistor in the electrical circuit dictates the blower speed. Refer to HVAC Blower Controls Circuit Description in Heating Ventilation and Air Conditioning for complete wiring information for the A/C electrical system.