Subaru LEGACY 2002 Quick Reference Index page 492

HVAC System (Heater, Ventilator and A/C)
5. LUBRICATION
The lubrication oil is collected at the bottom of the high-pressure chamber. The high-refrigerant
pressure in the chamber forces the oil upward through the oil passages in the front side block to
lubricate the front end of the rotor. The high-chamber pressure also forces the oil through the pas-
sages in the bottom of the cylinder to lubricate the rear end of the rotor. The oil that has lubricated
each end of the rotor enters the low-pressure chamber by the internal pressure of the compressor.
The oil contained in the gaseous refrigerant from the evaporator passes through the low-pressure
chamber and lubricates the rear bearing. The oil also passes through the passage in the drive
shaft and lubricates the front bearing and shaft seal before entering the suction port of the cylinder.
Since the pressure in the suction port of the cylinder is slightly lower than that in the low-pressure
chamber, the oil that has lubricated all the parts enters the suction port and is finally brought by
the refrigerant back to the high-pressure chamber.
(1) Front bearing
(2) Vane
(3) Rear bearing
COMPRESSOR
(4) Low-pressure chamber
(5) Rotor
(6) Oil port
AC-20
(7) High-pressure chamber
(8) Shaft seal
B4H0752A