Best I can tell there should be a vacuum switch somewhere in the coolant system that will pass vacuum to the actuator and once it's heated up will probably close/stop vacuum to the actuator. Some pics I've found on the WWW show a switch mounted in the thermostat housing. This engine's thermostat housing doesn't have this capability.
Dave
The actuator is for the EFE system which is designed to make the engine heat up faster to reduce emissions. The actuator should close when the engine starts up and open when the engine has warmed up. Apparently the V8s switched the vacuum on/off to the actuator using water temp while the L6 used oil temp. The oil temp vacuum switch (TVS) should be found just above the starter.
