Fuhjythy Radiator Cap, Replace 16401-31650, for 4Runner, GX470, IS250 IS350, GS350 GS450H

REPLACES PART # : 16401-31650, 1640131650 Once you have a replacement and your engine is cool, simply unscrew the old cap, and install the new by screwing it on. REPLACEMENT RADIATOR CAP : The radiator cap holds the coolant inside the radiator, but it also works as a two-way valve that keeps the right pressure inside so the radiator does it work correctly. If the pressure isn't maintained, the coolant can boil and evaporate, putting the engine at risk of overheating. Symptoms of a Bad Radiator Cap: air enters the system, low coolant level, coolant leaks, overflowing reservoir, overheating engine. COMPATIBLE WITH VEHICLES : - 2003-2010 4Runner, 2007-2010 , 2005-2009 , 2003-2009 GX470, 2006-2012 IS250 IS350, 2007-2011 GS350 GS450h Professional, high quality style and meet or exceed all equipment performance replacement radiator cap. Constructed with premium materials for durability. Designed to function on open cooling systems and overflow reservoir type systems and allows the cap to be installed and removed much easier.