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.
High/Low Pressure Cut-Out Switch
High/low pressure cut-out switch is a dual-pressure switch located forward of left front strut tower on liquid line. Switch contains 2 sets of contacts. PCM disengages compressor clutch if either set of contacts open.
PCM will de-energize A/C compressor clutch relay when discharge pressure is greater than 380-401 psi (26.7-28.2 kg/cm2 ) and energize A/C compressor clutch relay when discharge pressure is 200-251 psi (14.1-17.6 kg/cm2 ). PCM will energize cooling fan relay for 180 seconds after A/C compressor clutch relay is de-energized because of pressure switch activation. PCM will de-energize A/C compressor clutch relay if discharge pressure is less than 40 psi (2.8 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.