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
The pressure cycling switch is located on accumulator. It senses low side system pressure and controls power circuit to A/C compressor relay. Pressure cycling switch is normally closed at pressures more than 43-49 psi (3.0-3.4 kg/cm2 ), and open at pressures less than 23-25 psi (1.6-1.7 kg/cm2 ).
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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.