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Subaru R-134A User Manual

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Subaru Air Conditioning Systems
Standard Compressor Systems
➊ System performs to 
specifications; test complete
➋ Higher than normal 
pressures indicate:
—Restriction of air across 
condenser
—Defective cooling fan(s)
—Refrigerant overcharge
—Restriction in system
—Air in system
—Moisture in system
➌ Lower than normal 
pressures indicate:
—System is undercharged
—Compressor is defective
Variable Displacement
Compressor Systems
➊ System performs to 
specifications, test complete
➋ Higher than normal 
pressures indicate:
—Restriction of air across 
condenser
—Defective cooling fan(s)
—Refrigerant overcharge
—Restriction in system
—Air in system
—Moisture in system
➌ Lower than normal 
pressures indicate:
—Compressor has shifted 
to minimum stroke
• Stop engine
• Wait ten (10) minutes, retest
—System is undercharged
• “Clunking” sound is normal 
while charging  system
—Compressor is defective
Control Valve Testing—
Variable Displacement
Compressor
➊ Bring compressor to the 
minimum stroke position
—Open hood and windows
—Set engine speed to fast idle
—Set blower speed to low
—Set A/C control to A/C MAX
➋ Suction pressure should 
be 25-35 psi
Note: When inlet air temperature 
to evaporator is “LOW”, the 
discharge pressure may appear 
to be excessively “LOW” and 
bubbles may be seen in sight 
glass. This condition is normal.
➌ Lower than normal 
pressure indicates:
—System is undercharged, or
—Compressor is NOT 
changing to minimum stroke
➍
Switch system “ON” and 
“OFF”
➎
If high and low side 
pressures remain equal
—Extreme System 
undercharge, or
—Defective compressor
Note: The clutches on the variable 
displacement Calsonic and 
DIESEL KIKI compressors are 
not serviceable. Always refer to 
the current Subaru Service 
Bulletins for possible future 
changes to this procedure.
Number Date
Title
Remarks
15-42-87
05-18-87
Accessory A/C 
Justy S0A332A105
15-44-87
05-26-87
Accessory AC 
(S0A332A1 05)
Install on (4EAT)
02-70-89
08-24-89
Idle Speed  
Adjustment Procedure
for MT/ECVT
02-72-89
05-07-86
Idle Speed 
Addendum to Service
Adjustment Procedure 
Bulletin #02-70-89
for MT/ECVT
10-49-88
08-04-88
Fresh/Circ Air Lever 
Not Holding Position
10-50-89
05-29-89
Heater Gears 
(87-89 ‘L’ Series)
10-51-89
05-29-89
Compressor Oil (Legacy)
10-52-89
07-28-89
V-5 Compressor & A/C 
System Service Information
10-53-89
10-18-89
A/C System Servicing
10-55-90
01-29-90
Discontinued Shorting Loop
For A/C Cut Relay
10-56-90
01 -29-90 Heater Gears - ‘87 to ‘89
‘L’ Series & XT Models
Number Date
Title
10-57-90
05-29-90
A/C  Compressor Inspection
10-58-90
05-30-90
Thermoprotector Service Procedure
10-59-90
07-06-90
Thermoprotector Testing
Procedure Clarification
10-60-90
08-14-90
Automatic Climate Control 
Diagnostic Information
10-61-91
07-02-91
Removal and Recycling of
Refrigerant R-1 2
10-62-91
09-20-91
Wynn’s Justy A/C 
SOA329A110 & S0A329A112
10-63-93
04-12-93
R-134a Refrigerant Handling Procedures
10-64-93
11-08-93
Heater Vent Door Binding Or Leaking Air
10-65-94
03-08-94
Proper Oils For Subaru A/C Systems
10-66-94
06-17-94
R-12 and R-134a Air Conditioning System 
Handling Procedures
10-67-94
11-11-94
Clicking Noise From The Heater 
Mode Door Actuator
10-68-96R
07-01-98
Air Conditioning Retrofit Procedures 
R-12 to R-134a
Performance Test Results
Related Air Conditioning Service Bulletins
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