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.
Pressure Cycling Switch
Switch is mounted on low-side Schrader valve type fitting and controls compressor operation. If low-side pressure decreases to approximately 23 psi (1.6 kg/cm2 ), switch opens, interrupting power to compressor clutch. When pressure increases to about 46 psi (3.2 kg/cm2 ), switch closes, providing power to compressor clutch. Switch maintains evaporator surface at a temperature slightly warmer than freezing, to prevent evaporator icing and airflow blockage during normal system operation.
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Use the Manual With the Right Hardware
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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.