Replacement Coolant Reservoir Cap — OEM 1647123030 Fits: Toyota Corolla 2014–2019 and Scion models 2006–2018 Key benefits Protects the cooling system: Maintains correct system pressure to prevent coolant loss and reduce the risk of overheating and related engine damage. Secure, leak seal: Replaces part number 1647123030 for an exactmatch seal that restores reliable coolant containment. Durable, heatresistant construction: Made from quality, heatresistant plastic to withstand underhood temperatures and deliver longlasting performance. OEMsized fit: Engineered to match the original dimensions so it fits and functions like the factory part. Why you need this part A failing reservoir cap can allow coolant to escape or let pressure drop, causing overheating, poor heater performance, and potential engine damage. Replacing a worn or damaged cap restores proper pressure control and prevents avoidable repairs. Using an exact replacement for part 1647123030 preserves the cooling system's designed performance and reduces the chance of leaks or fitment issues. Compatibility and technical points Direct replacement for OEM part number 1647123030. Compatible with Toyota Corolla model years 2014 through 2019 and Scion models 2006 through 2018. Material: heatresistant plastic selected for thermal durability and chemical resistance to coolant. Function: seals the coolant reservoir, maintains system pressure, and prevents coolant loss. Typical applications / use scenarios after a leak or crack: a worn or damaged reservoir cap to stop visible coolant leaks and restore proper pressure control. Preventive maintenance before a long drive or seasonal service: Swap the cap to ensure the cooling system is sealed and pressure is correct, reducing the risk of breakdowns on the road. Routine engine service or cooling system rebuild: Install this OEMmatching cap when replacing hoses, thermostat, or radiator to maintain factory specifications and avoid future leaks. Notes for installation This part is intended as a direct replacement for part number 1647123030. Verify vehicle year and model compatibility before installation. No special tools required for cap replacement; follow standard coolingsystem service procedures and allow the engine to cool before removing the original cap.