Firebird V8-305 5.0L VIN F FI (1987)
![background image](/pontiac/firebird/v8-305_5.0l_vin_f_fi/Page-997001.png)
Thermostatic Air Cleaner Vacuum Switch: Description and Operation
Thermac Secondary Vacuum Break Thermal Vacuum Switch (SVB-TVS)
This switch acts as a vacuum connection for the thermac air cleaner control and a thermal control for the secondary vacuum break diaphragm. Ports 1
and 2 of this switch are always connected and port 3 is sealed when cold and connected to the other ports when warm.