Subaru R-12 - Manual (Page 9)

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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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