Recirculation Operation
The HVAC control module controls the air intake through the recirculation actuator. Recirculation is not available when the mode is in DEFROST. When the mode is in DEFOG, recirculation will only be available for ten minutes. The operator must activate the blower for recirculation operation. The A/C high-pressure recirculation switch can cause the HVAC system to recirculate air. If the recirculation switch is pressed into the On position when the mode switch is in an unavailable mode position, then the recirculation switch LED will flash three times. When the high-side pressure reaches 320-380 psi (2206-2620 kPa), the PCM will place the HVAC system in recirculation mode. The high-side pressure is lowered when the inside air cools the refrigerant within the A/C evaporator. When the high-side pressure reaches 210-270 psi (1447-1861 kPa), the PCM will place the HVAC system out of recirculation mode.