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 MANUALSCHEVROLET1987HI-CUBE 6.2 J, 400/M40REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 35 (A/C-HEATER SYSTEM - MANUAL)COMPONENTS & FUNCTIONSPRESSURE CYCLING SWITCH
1987 Chevrolet Hi-Cube 6.2 J, 400/M40
Pressure Cycling Switch
1987 Chevrolet Hi-Cube 6.2 J, 400/M40SECTION Pressure Cycling Switch
WARNING: This page does not describe the selected car, but rather 38 other vehicles, including the 1987 Pontiac Sunbird, 1987 Pontiac Safari, 1987 Pontiac Grand Prix, 1987 Pontiac Grand Am, and 1987 Pontiac Firebird. However, it is still accessible from the selected car via links, so may be relevant.
Located near the top of the accumulator, this switch cycles the compressor on at 46 psi and off at 25 psi. Switch also turns off compressor in event of low refrigerant charge or cold (below 37°F) ambient temperatures.
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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.