Subaru LEGACY 2002 Quick Reference Index page 497

3. PRESSURE RELIEF VALVE
When the high pressure exceeds the maximum limit, the pressure relief valve opens and releases
the refrigerant into the atmosphere to protect the air conditioning system. This pressure relief valve
is designed to minimize the outflow of the refrigerant into the atmosphere.
CAUTION:
! When the pressure relief valve was operated, be sure to perform inspection and remove
the cause. Otherwise the problem will recur.
! A pressure relief valve that has opened due to an abnormally high pressure must not be
reused.
! If an abnormal condition occurs, the high- and low-pressure switch usually operates first
to stop the compressor. Therefore, the pressure relief valve is not always operated when
an abnormally high pressure is generated.
COMPRESSOR
Pressure relief valve operation characteristics
AC-25
HVAC System (Heater, Ventilator and A/C)
B4H1507B