Armada 4WD V8-5.6L (VK56DE) Flex Fuel (2009)
NOTE:
Apply engine coolant to the cap seal.
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Replace the reservoir cap if there is any damage in the negative pressure valve, or if the open-valve pressure is outside of the limit.
CHECKING RADIATOR CAP
Inspect the radiator cap.
NOTE:
Thoroughly wipe out the radiator filler neck to remove any waxy residue or foreign material.
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Replace the cap if the metal plunger cannot be seen around the edge of the black rubber gasket.
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Replace the cap if deposits of waxy residue or other foreign material are on the black rubber gasket or the metal retainer.
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Pull negative-pressure valve to open it and make sure that it closes completely when released.
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Make sure that there is no dirt or damage on the valve seat of radiator cap negative-pressure valve.
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Make sure that there are no unusualness in the opening and closing conditions of negative-pressure valve.