Electric Ported Vacuum Switch

The electric PVS is only used on some engines equipped with air injection and a catalytic converter. Two electric PVS valves are used, one with normally closed contacts and one with normally open contacts. On both types of switches, the center and bottom ports operate in the same manner as a regular three port PVS. On normally closed contact PVS, the contact is closed until coolant temperature reaches 235°F (113°C), at which time the contact opens. On the normally open contact PVS, the contact is open until coolant temperature reaches 235°F (113°C), at which time the contact closes.