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THERMO Valve & Purge Control Valve

  1. Ensure vacuum lines are properly routed and are not damaged or obstructed. With engine coolant temperature below 149°F/65°C, disconnect upper vacuum hose from purge control valve. Connect vacuum gauge to hose.
  2. Start engine and run at idle. Vacuum should not be present. If there is vacuum, test purge cut-off solenoid valve. See PURGE CUT-OFF SOLENOID VALVE  test. If there is no vacuum, remove vacuum gauge and reconnect hose.
  3. With engine coolant temperature above 149°F/65°C, disconnect upper vacuum hose from purge control valve. Run engine at idle and observe vacuum gauge. Vacuum should be present, after 5 seconds of operation.
  4. If there is no vacuum test purge cut-off solenoid valve. See PURGE CUT-OFF SOLENOID VALVE  test.
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