Bimetal Vacuum Switching Valve (BVSV): Starlet
- Drain coolant from radiator and remove BVSV. Immerse threaded end of BVSV in container of water with thermometer.
- With water temperature below 104°F (40°C), blow air into top pipe and check that BVSV is open. Heat water to above 129°F (54°). Blow air into top pipe and check that BVSV is closed.