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Water THERMO Valve Check

  1. Remove water thermo valve from engine. Immerse water thermo valve in a container of water.
  2. Heat up water gradually and observe the temperature. Below approx. 140°F (60°C) air should pass from top vacuum line to bottom vacuum line. Above approx. 140°F (60°C) air should pass from bottom vacuum line too orifice on top of thermo valve.
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