Thermal Vacuum Switching Valve (TVSV): Tercel

1. Remove valve from engine. Dip sensing portion of valve into water below 45°F (7°C). By blowing air into pipes, check that air flows from pipe "J" to pipes "M" and "L" and from pipe "K" to pipe "N".
2. Heat valve to 63-122°F (17-50°C). Check that air flows from pipe "K" to pipes "N" and "L" and from pipe "J" to pipe "M". Heat valve to 154°F (68°C). Check that air flows from pipe "K" to pipes "M" and "L" and does not flow from pipe "J" to any other pipe. Replace valve if necessary.

Fig 1: Testing Thermal Vacuum Switching Valve

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