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.
Ported Vacuum Switches: Description
The Ported Vacuum Switches (PVS) are temperature sensitive vacuum controlling devices. The two port and three port PVS valves have three temperature ranges. Green PVS is calibrated at 68°F (20°C), Black PVS is calibrated at 100°F (38°C), and plain or Blue PVS are calibrated at 133°F (57°C).
The electric PVS is a combination vacuum switching and electric signalling device. There are two versions of the electric PVS valve, one with normally closed contacts and one with normally open contacts.
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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.