Hatchback 4WD F4-1781cc 1.8L (1983)
Refrigerant Oil: Technical Service Bulletins
A/C Compressor - Compressor Oil Information
ALL MODELS WITH SUBARU AIR CONDITIONING
This bulletin is for information only. Compressor oil will last indefinitely in a sealed system. Therefore, a compressor oil level check is necessary only
when the system is opened, such as for a component part replacement, or if there is a leak in the system.
COMPRESSOR OIL - Only "Suniso 5GS" or an equivalent refrigeration oil can be used in Subaru air conditioning systems. The refrigeration oil
must be free from moisture, dust, metal, etc. It should not be transferred from one container into another and the container must be capped when
not in use. Never return used oil to the container.
II. OIL RETURN PROCEDURE - Before checking the compressor oil level, the following procedure must be used to return the refrigerant oil to the
A minimal amount of refrigeration oil will remain in the rest of the system.
a). Place the mode lever in the "A/C MAX" position. b). Turn the thermostat to the coldest setting. c). Turn the fan switch to the highest
blower speed. d). Start the engine and run for twenty minutes at idle. e). Turn off the engine and slowly discharge the refrigerant from the
system. Observe all cautions mentioned in the 1983 Subaru service manual (MSA-116).
III. COMPRESSOR OIL LEVEL CHECK
HITACHI SYSTEM - SOA 204 080, SOA 204 081, SOA 204 082, SOA 204 083 or line installed A/C.
SYSTEM OIL SPECIFICATION - 150 cc (Sunico 5GS)
The above Hitachi systems do not require addition of refrigeration oil unless evidence of leakage is found or whenever the following component
parts are replaced.
COMPONENT PART TO BE REPLACED
AMOUNT OF OIL TO BE ADDED
Perform the oil return procedure if the system is capable of operation. If the system is not capable of operation, proceed to Step b.
After discharging the system, remove the failed compressor or evaporator according to the procedure given in the applicable Subaru Service
COMPRESSOR - When replacing a failed compressor, the amount of refrigeration oil in the failed unit must be drained and measured. Rotate
the compressor clutch (if possible) to ensure that all of the oil is removed.
The following chart indicates the amount of oil needed in the replacement compressor:
MORE THAN 70 cc
SAME AS THE COLLECTED AMOUNT
LESS THAN 70 cc
Since all Hitachi replacement compressors contain 150 cc of refrigeration oil, it will be necessary to drain some oil from the replacement compressor so
that the above requirements are met.
UNDER NO CIRCUMSTANCES SHOULD MORE THAN 80 cc OF REFRIGERATION OIL BE DRAINED FROM A REPLACEMENT
LONE STAR SYSTEM - SOA 203 080, SOA 203 081, SOA 203 082, SOA 203 083.
SYSTEM OIL SPECIFICATIONS
SOA 203 083 - 150 cc
DIESEL KIKI COMPRESSOR
SOA 203 082 - 175 cc
SOA 203 081 - 175 cc