Thermostatic Vacuum Switching Valve (TVSV)
- Drain coolant from radiator and remove TVSV. Place threaded end of valve in container of ice water with thermometer.
- With temperature below 45°F (7°C), check that air flows from pipe "J" to pipe "M" and "L" and from pipe "K" to pipe "N". See Fig 1.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Heat water to 63-122°F (17-50°C). Check that air flows from pipe "K" to pipe "N" and "L" and from pipe "J" to pipe "M".
- Continue heating water to above 154°F (68°C). Check that air flows from pipe "K" to pipe "M" and "L" and does not flow from pipe "J" to any other pipe. If problem is found, replace the TVSV.