Assessments - 3, GPA: 4
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What we will do instead is to give you a cross-section summary of recent Subaru air conditioning systems. We’ll show you what’s unique and different about each system, and describe the best troubleshooting and repair strategies for these systems. In compliance with government requirements, all Subaru vehicles manufactured within the past few years are equipped with R-134a air conditioning systems. But there are still a large percentage of Subaru vehicles on the road with R-12 refrigerant in their A/C sytems. We’ll explain how to safely handle R-12 and R-134a refrigerants, and we’ll also explain your repair and retrofit options when a Subaru equipped with an R-12 air conditioning system comes to your shop for repairs. Subaru Air Conditioning Systems Introduction End WrenchThe O ver the years, Subaru air conditioning systems have taken many different 4 Air Flow System The purpose of the air flow system is to provide air to the heating, ventilation, defroster, and air conditioning systems. Control of the air flow is accomplished by four types of systems which are Subaru model specific: E Manual cable - Justy E Manual cable/vacuum -Loyale I Manual cable/electric - Legacy, Impreza, and XT I Automatic electric - SVX The mode selector controls the routing of air to the defroster, heater core, air conditioning evaporator, and the outlet ducts. The temperature control lever adjusts the temperature of the air admitted to the passenger compartment and regulates the flow of air through the heater core via the air mix doors. The fan switch controls the speed of the fan and thus the volume of air that flows through the evaporator and heater cores. Loyale vehicles have vent control levers which are not a part of the mode selector switch. These are manually adjusted by the driver and passenger to admit or restrict the flow of outside air through side vent outlets. The Legacy and the Impreza have eight position mode panels while the Loyale and XT have six button panels. The additional VENT mode supplies outside air to the passenger compartment through the dash vents. The flow of vent air may be increased by using the fan, and heated by increasing the temperature control setting. The DEF/HEAT mode switches the A/C com pressor ON and supplies air flow to the defrost and floor outlets. The remaining mode switches operate similar to other Subaru A/C system controls. The air flow unit used on Legacy vehicles equipped with manual A/C systems is similar to the unit used on Automatic Climate Control “L” Series Air Flow System Controls Vent Switches Systemsequipped vehicles. Loyale Vacuum System (Mode Control) Only Loyale vehicles use a manually actuated vacuum operated system to control the position of the mode and circulation shutter actuators. The vacuum system operates the air flow shutters in all Loyale vehicles. Check vacuum to the shutter actuators if the defroster, floor vents, or fresh air vents do not operate properly. The vacuum system also provides vacuum to the FICD diaphragm based upon FICD solenoid signal, if so equipped. XT Mode Control System In XT vehicles, the electrical mode control system operates the various mode shutters and doors. Electric motors control the operation of the air flow shutters in the XT. The motors operate the shutter actuators through a gear drive and linkage assembly. If the flow of air through the defroster, floor vents, or other vents is insufficient, check operation of the shutter actuators and switches. Legacy/Impreza Mode Panel Electrical System Operation A/C Cut System This system is installed on many 1987 and later model year automatic transaxle equipped Subaru vehicles. The purpose of the A/C cut system is to improve engine performance during full throttle acceleration. Refer to the chart to determine component application for the various models listed. Note: All sequential MFI equipped vehicles feature A/C cut systems. Model XT / XT6 / ”L” ”L” Legacy SVX Justy Impreza Justy ”L” / HB Fuel System Trans MFI 4EAT MFI 3AT TBI MFI ALL Carb ECVT Carb 3AT Components A/C A/C Cut K/D K/D Cut Unit SW. Relay Relay ECM TPS Map A/C Cut System 5 Subaru Air Conditioning Systems Bypass Adjusting Screw (ECVT) Fast Idle Control Device (A/C Idle Air Control) On manual transaxle equipped Justy vehicles, the FICD is incorporated in the idle-up system. Proper adjustment and operation is outlined in Service Bulletins 02-70-89 and 02-72-89. On ECVT equipped carbureted vehicles an air/fuel bypass control system performs the FICD function. The ECVT air bypass control system consists of an air bypass valve, an adjusting screw, and an air bypass solenoid. The system is designed to increase idle speed whenever the A/C relay is activated by supplying additional air/fuel into the intake manifold. Bypass air enters through the air horn on the secondary side. The airflow is regulated by an adjusting screw. When the bypass valve opens, bypass air/fuel enters the manifold below the secondary throttle plate. When the a...
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