My 1977 Coupe Deville 425 has a 4-port Thermal Vauccum Switch mounted in the front of the engine that operates on a heat signal from the water jacket.
The TVS has 4 ports:
- line from ported vacuum in Rochester Quadrajet.
- line from port diectly into intake manifold.
- line directly to EGR valve
- line directly to vacuum advance unit on distributor
How are the two different vaccuums routed to the two vacuum actuators inside the TVS itself?
Thanks for your help.
Tich.