A/C Pressure Transducer
WARNING: This page is about a different car, the 2015 Lincoln MKS. However, it is still accessible from the selected car via links, so may be relevant.
The A/C pressure transducer monitors the compressor discharge pressure and sends a variable voltage signal representing the pressure to the PCM. The PCM interrupts A/C compressor operation in the event the A/C pressure transducer indicates high system discharge pressures. It is also used to sense low charge conditions. The PCM prevents the A/C clutch from engaging if the pressure is below a predetermined value for a given ambient temperature. It is not necessary to recover the refrigerant before removing the A/C pressure transducer.