BVSV 1

Drain coolant from radiator into container. Remove BVSV 1 and immerse in coolant. Using ice, lower coolant temperature to below 14°F (-10°C). Check that air flows from pipe "J" to pipe "L". See Fig 1.
Heat coolant to above 39°F (4°C). Check that air flows from pipe "J" to pipe "K".

Fig 1: Bimetal Vacuum Switching Valve 1 & 2 Test
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Supra models only.