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:
➊Manual cable - Justy
➋Manual cable/vacuum
➌ Manual cable/electric - Legacy,
Impreza, and XT
➍ Automatic electric - SVX
The mode selector controls the rout- ing 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 compart- ment 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 oningselector 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 equipped vehicles.
“L” Series Air Flow System Controls
Vent Switches
Loyale Vacuum System (Mode Control)
Legacy/Impreza Mode Panel
Only Loyale vehicles use a manually actuated vacuum operated system to |
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control the position of the mode and circulation shutter actuators. |
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The vacuum system operates the air flow shutters in all Loyale vehicles. Check |
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vacuum to the shutter actuators if the defroster, floor vents, or fresh air vents do |
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not operate properly. The vacuum system also provides vacuum to the FICD |
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diaphragm based upon FICD solenoid signal, if so equipped. |
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XT Mode Control System |
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In XT vehicles, the electrical mode control system operates the various mode |
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shutters and doors. |
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Electric motors control the operation of the air flow shutters in the XT. The |
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motors operate the shutter actuators through a gear drive and linkage assembly. |
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If the flow of air through the defroster, floor vents, or other vents is insufficient, | Electrical System Operation |
check operation of the shutter actuators and switches. |
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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.
Components
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Model | System | Trans | A/C |
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| A/C |
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| Cut | K/D | K/D | Cut |
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| Unit | SW. | Relay |
| Relay | ECM |
| TPS | Map |
XT / XT6 / ”L” | MFI |
| 4EAT |
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”L” | MFI | 3AT |
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| TBI |
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Legacy SVX | MFI |
| ALL |
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Justy Impreza |
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Justy | Carb |
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”L” / HB | Carb | 3AT |
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A/C Cut System
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