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EVAP Thermal Vacuum Valve

  1. Drain cooling system. Remove EVAP TVV located in coolant passage. See Figure.
  2. Use cool water to cool threaded end of EVAP TVV to less than 50°F (122°C). Apply air pressure to top vacuum hose port on EVAP TVV. Ensure EVAP TVV is closed and air does not flow from lower vacuum hose port on EVAP TVV.
  3. Heat water to greater than 149°F (65°C). Apply air pressure to top vacuum hose port on EVAP TVV. Ensure EVAP TVV is open and air flows from lower vacuum hose port on EVAP TVV. Replace EVAP TVV if defective. Apply thread sealant on threads of EVAP TVV and reinstall.
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