Aluminum Coolant Overflow Expansion Tank for Nissan 240SX (1995-1998) 2.4L

Heavy-Duty Aluminum Coolant Overflow Expansion Tank for 1995-1998 Nissan 240SX (S14)

What it Does: The Aluminum Coolant Overflow Expansion Tank replaces the aged, crack-prone factory plastic reservoir on the 1995-1998 Nissan 240SX to eliminate coolant loss, prevent system pressure leaks, and improve thermal resilience under load.

The Stock Nissan 240SX Plastic Tank Fatigue

The OEM blow-molded polyethylene overflow bottle found on the S14 chassis degrades rapidly due to prolonged exposure to under-hood thermal cycling and ultraviolet rays. Over decades of operation, the polymer loses its plasticizers, turning brittle and yellowed. Repeated heating and cooling cycles alongside cooling-system pressure variances cause hairline stress fractures, particularly around the mounting tabs and inlet/outlet neck fittings. In high-rpm or drifting applications, these micro-cracks expand, yielding unpressurized coolant weeping, boil-overs, and potential catastrophic overheating of the KA24DE cylinder head.

The Engineering Solution

Fabricated from high-grade aluminum sheet, this 1.7-liter replacement tank is built to withstand repeated thermal expansion cycles without structural deformation or seam failure. Each joint is precision TIG welded and pressure tested to help ensure absolute hydraulic integrity under operating temperatures. The unit retains factory volumetric capacity and incorporates precision mounting tabs engineered specifically for the S14 chassis mounting points. Aluminum provides superior heat rejection compared to virgin plastic, resisting chemical corrosion and preventing ballooning, while the included cap maintains positive retention during track driving.

Technical Specifications

Compatibility

• 1995 - 1998 Nissan 240SX Base 2.4L
• 1995 - 1998 Nissan 240SX SE 2.4L
• 1995 - 1998 Nissan 240SX LE 2.4L

Frequently Asked Questions

Does this fit the S14 240SX?

Yes, this is a direct fit for the 1995-1998 Nissan 240SX equipped with the KA24DE engine.

Are modifications required to install this tank?

No, it bolts directly into the OEM mounting brackets and utilizes factory coolant overflow hose routing with no cutting or drilling required.

The Nissan Track-Tested Standard

Chassis engineered during the golden era of JDM rear-wheel-drive platforms require cooling hardware capable of sustaining aggressive high-RPM rev limits and extended lateral loads without fluid failure.