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THERMOVALVE & Purge Control Diaphragm Valve

  1. With engine coolant temperature below 97°-111°F (36-44°C), remove upper hose from purge control diaphragm valve and connect vacuum gauge to hose. Start engine and run at idle speed. Check that there is no vacuum. If there is vacuum, replace thermovalve and retest.
  2. With engine coolant temperature above 97°-111°F (36°-44°C), remove upper hose from purge control diaphragm valve and connect vacuum gauge to hose. Start engine and run at idle speed. Check that there is vacuum.
  3. If there is no vacuum, check thermovalve by pinching off hose between thermovalve and air cleaner. If there is vacuum, replace thermovalve. If there is no vacuum, check connecting vacuum hoses for leaks and obstructions.
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