Thermostatic Vacuum Switching Valve (TVSV): Tercel
- 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.
- 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 TVSV does not operate as described, replace it.
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