Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU1998LEGACY BRIGHTON WAGON AWD F4-2.2L SOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACDESCRIPTION AND OPERATIONAIR CONDITIONING SYSTEMCOMPRESSOR CONTROL SYSTEM
1998 Subaru Legacy Brighton Wagon AWD F4-2.2L SOHC
Compressor Control System
1998 Subaru Legacy Brighton Wagon AWD F4-2.2L SOHCSECTION Compressor Control System
Compressor Control System
SCHEMATIC
1. When the A/C switch and fan switch are turned ON, the A/C relay activates. The compressor is turned on, and then the main and sub fans also operate. Blower relay operates to direct the air flow rate determined by FAN switch position.
2. The thermo amplifier activates to stop the main and sub fans, and disengage compressor clutch.
3. When the "High-Low" pressure switch operates, disengage the compressor clutch, and the main and sub fans are stop.
SCHEMATIC
Compressor Control System - Schematic:
1. When the A/C switch and fan switch are turned ON, the A/C relay activates. The compressor is turned on, and then the main and sub fans also operate. Blower relay operates to direct the air flow rate determined by FAN switch position.
2. The thermo amplifier activates to stop the main and sub fans, and disengage compressor clutch.
3. When the "High-Low" pressure switch operates, disengage the compressor clutch, and the main and sub fans are stop.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.