Recirculation Mode

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The recirculation door will move automatically with an input from the A/C high pressure recirculation switch at approximately 2413 kPa (350 psi). 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. The recirculation actuator door control circuit is grounded by the PCM to ensure that the actuator is forced to the recirculation position. This allows for the cooler inside air to flow over the A/C evaporator and cool the refrigerant, until the high side pressure returns to normal. This action will allow the high side pressure to return to normal pressure at a faster pace. The recirculation door will move back to the outside air position when the high side pressure reaches 1724 kPa (250 psi).