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Thermovalve (Federal Models)

  1. Mark vacuum hoses for installation reference. Disconnect vacuum hoses from thermovalve. Connect a hand held vacuum pump to thermovalve fitting. Apply vacuum.
  2. With engine coolant temperature less than 122°F (50°C), vacuum should not hold. With engine coolant more than 176°F (80°C), vacuum should hold. Replace thermovalve if it does not function as described.
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