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.
It is extremely important to always make sure to allow the engine to cool down before removing the radiator cap, as removing the cap from a hot system can cause sudden coolant spray and severe burns.
A faulty radiator cap can have a huge impact on the cooling performance of your vehicle, once you have a replacement and your engine is cool, simply unscrew the old cap, and install the new by screwing it on.

Compatible with Toyota Vehicles:
2003-2009 4Runner 4.0L V6 ( To 01/2009 )
2010 4Runner 2.7L L4
2007-2011 FJ Cruiser
2005-2011 Tacoma

Compatible with Lexus Vehicles:
2006 GS300
2007-2011 GS350
2007 GS430
2007-2011 GS450h
2010-2011 GX460
2003-2009 GX470
2006-2012 IS250
2006-2012 IS350

Replaces Part #: 16401-31650, 1640131650 radiator cap.

NOTE: This is NOT a genuine part, it's a aftermarket replacement part manufactured by Allmotorparts.

NOTE: To ensure accurate fitment, please confirm your vehicle information in the above compatibility section and the description.