Frontier XE King Cab 4WD V6-3.3L (VG33E) (2002)
High Pressure Safety Valve HVAC: Description and Operation
Pressure Relief Valve
The refrigerant system is also protected by a pressure relief valve located on the flexible high pressure hose near the compressor. When the pressure of
refrigerant in the system increases to an abnormal level [more than 3,727 kPa (38 kg/sq.cm, 540 psi)], the release port on the pressure relief valve
automatically opens and releases refrigerant into the atmosphere.