Thermostatic Vacuum Switching Valve (Starlet)
- Drain coolant from radiator and remove TVSV. Immerse threaded end of valve in container of water with thermometer.
- With water temperature below 106°F (41°C), check that air flows from port J to port N and from port L to port M. See Fig 1. Heat water to above 131°F (55°C). Check that air flows from port J to port K and from port L to port M.