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Thermostatic Vacuum Switching Valve (TVSV): Starlet

  1. Drain coolant from radiator and remove TVSV. Place threaded end of valve in container of water with thermometer. With temperature below 106°F (41°C), check that air flows from port "J" to port "N" and does not flow from port "L" to port "N". See Figure.
  2. Heat water to above 131°F (55°). Check that air flows from port "J" to port "K" and from port "L" to port "M". If TVSV does not operate as described, replace it.
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