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 Cut-Off Switch
The pressure cut-off switch is used to interrupt compressor operation in event of high system discharge pressures. Pressure cut-off switch is mounted on a Schrader valve-type fitting on high pressure side of A/C manifold and tube. A valve depressor, located inside threaded end of A/C pressure cut-off switch, presses on Schrader valve stem. This allows A/C pressure cut-off switch to monitor compressor discharge pressure.
When compressor discharge pressure rises, switch contacts open, disengaging compressor. When pressure drops, contacts close to allow operation of compressor. See SPECIFICATIONS . It is not necessary to discharge refrigerant system to remove pressure cut-off switch.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.