Radiator Coolant Overflow Tank Reservoir Toyota RAV4 Lexus NX200t NX300h (2006-2018) 2.0L 2.5L

Direct-Fit Radiator Coolant Overflow Tank Reservoir for 2006-2018 Toyota, Lexus Rav4, NX

This coolant reservoir replaces compromised factory expansion tanks, ensuring proper fluid recovery and maintaining optimal system pressure.

The Stock Rav4, NX Thermal Cycling Vulnerability

Over thousands of miles, the factory OEM plastic coolant expansion tank on the XA30, XA40, and AZ10 chassis is subjected to severe thermal cycling. Operating in a high-temperature engine bay alongside the 2AR-FE or 8AR-FTS powerplants, the original polymer structure gradually degrades. This continuous heating and cooling causes the plastic to become brittle, resulting in micro-fractures along the factory seams and pressurized coolant leaks. Once compromised, the cooling system loses pressure retention, reducing the coolant's boiling point, risking critical heat soak, and ultimately threatening the head gasket integrity.

The Engineering Solution

This replacement reservoir is manufactured to exact factory specifications using high-impact thermoplastic polymers engineered to resist severe thermal degradation. The revised material matrix provides superior resistance to antifreeze compounds and under-hood heat saturation. By fortifying the seam welds, this tank eliminates the failure points of the original design. It includes a precision-calibrated pressure cap to guarantee accurate system pressurization, ensuring optimal thermal transfer in the radiator and preventing coolant from boiling off under load. Installation is a direct bolt-on procedure with no modifications required to the factory brackets or routing.

Technical Specifications

Compatibility

• 2015-2017 Lexus NX200t 2.0L Turbo
• 2018-2021 Lexus NX300 2.0L Turbo
• 2015-2021 Lexus NX300h 2.5L Hybrid
• 2006-2018 Toyota RAV4 2.5L
• 2006-2018 Toyota RAV4 2.5L Hybrid

The Toyota, Lexus Reliability Standard

Maintaining a sealed cooling system ensures your RAV4 or NX continues to deliver the unwavering reliability and thermal efficiency expected from superior JDM engineering.