[REPLACEMENT RADIATOR CAP] The radiator cap keeps the coolant inside the radiator, but it also functions as a two-way valve that maintains the correct pressure inside for the radiator to function properly. Symptoms of a Bad Radiator Cap: Air Entering the System, Low Coolant Level, Coolant Leaks, Overflowing Reservoir, Overheating Engine. [FITS VEHICLES] , - Accord, , , Elements, Fit, , Pilot, , S2000, , TL, , RL, , TLX, TSX, ZDX [REPLACES PART] 19045-RAA-003, 19045RAA003, 19045 RAA 003 Radiator Cap. Professional styling and high quality and meet or exceed all equipment performance replacement radiator caps. Constructed with quality materials for durability. [FRIENDLY NOTE] It is extremely important to always ensure the engine is cool before removing the radiator cap, as removing the cap from a hot system can cause sudden spray of coolant and serious burns. Manufacturer Part Number: 19045-RAA-003 Fits the following vehicles: for for 2013-2014 ILX for 2007-2019 for 2007-2018 for RL