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 MANUALSSUBARU2002LEGACY GT WAGON AWD F4-2.5L SOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGREFRIGERANT PRESSURE SENSOR / SWITCHDESCRIPTION AND OPERATION
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHC
Refrigerant Pressure Sensor / Switch: Description and Operation
2002 Subaru Legacy GT Wagon AWD F4-2.5L SOHCSECTION Description and Operation
Pressure Switch
The pressure switch is located on the high-pressure line to the receiver drier. When an abnormally high or low pressure occurs in the high-pressure line, the pressure switch turns OFF to stop operation of the compressor.
- When the pressure is abnormally low [177 kPa (1.8 kg/sq.cm, 26 psi) or less]
The pressure switch turns OFF assuming that the refrigerant is lost due to leakage.
- When the pressure is abnormally high [2,940 kPa (30 kg/sq.cm, 427 psi) or more]
The pressure switch turns OFF to prevent the system from being damaged.
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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.