Recirculation Mode

When the Recirculation (REC) switch is pressed, a signal is sent from the HVAC control module to the recirculation actuator through the recirculation door motor control circuit. When the amplifier circuit receives the signal, the recirculation actuator moves into the recirculation mode. This brings air from inside the vehicle instead of fresh air from the outside. Power and ground are provided to the recirculation actuator by the ignition 3 voltage circuit and the ground circuits through the left instrument panel junction block and splice pack. Recirculation is only available when the HVAC control module is either in Vent or Bi-Level mode only. Vent and Bi-Level are the first 8 or 17 detents on the mode switch. An A/C request is made anytime the recirculation button is selected. The recirculation mode will stay on and the LED will illuminate until either outside air or a non-recirculation mode is selected or the next key-on ignition cycle. Recirculation is can be selected with the blower motor in either the ON or OFF position.

The recirculation door will move automatically with an input from the A/C high pressure recirculation switch. The PCM will place the A/C system in recirculation mode when a signal is sent over the A/C refrigerant high pressure cut-out switch signal circuit. This allows for the cooler inside air to flow over the A/C evaporator and cool the refrigerant temperature, until the high side pressure returns to normal.