Silicone Radiator Hose Kit for Scion xB xA (2004-2007) 1.3L 1.5L

High-Durability Silicone Radiator Hose Kit for 2004-2007 Scion xB,xA (NCP31 / NCP61)

What it Does: The Silicone Radiator Hose Kit replaces the aged factory rubber coolant lines on the 2004-2007 Scion xB and xA to eliminate hose expansion, resist electrochemical breakdown, and maintain reliable coolant circuit flow under high thermal loads.

The Stock Scion xB,xA Hose Degradation

Stock vulcanized EPDM rubber hoses on the NCP31 and NCP61 chassis deteriorate over extended heat cycles. Operating in compact engine bays accelerates electrochemical degradation (ECD), causing OEM rubber to harden, develop micro-cracks, and form soft blisters near connection necks. As the factory rubber weakens, it swells under pressure, reducing coolant velocity through the radiator core and increasing the risk of sudden burst failures on high-mileage 1NZ-FE and 2NZ-FE powerplants.

The Engineering Solution

Engineered as a direct-fit upgrade, this kit utilizes 3-ply high-grade silicone reinforced with a 4.5 mm wall thickness to deliver superior burst pressure resistance and thermal stability across -65°F to 350°F. The multi-layer reinforced silicone will not dry rot, swell, or crack under repetitive heat soaking. Each hose is pre-formed to match OEM junction geometry on the radiator inlet, outlet, and bypass circuits, while the included stainless steel worm-drive clamps apply balanced radial tension to eliminate coolant weeping at aluminum hose bibs.

What's Included

• 3 Silicone Radiator Hoses (red, 3-ply, 4.5 mm wall)
• 6 Stainless Steel Worm-Drive Clamps

Technical Specifications

Compatibility

• 2004-2007 Scion xB 1.5L 4-Cylinder (1NZ-FE)
• 2004-2007 Scion xA 1.5L 4-Cylinder (1NZ-FE)
• 2004-2007 Scion xA 1.3L 4-Cylinder (2NZ-FE)

Frequently Asked Questions & Fitment Warnings

Does this fit the NCP31 / NCP61 xB,xA?

Yes, this is a direct fit for the 2004-2007 Scion xB,xA equipped with the 1NZ-FE 1.5L or 2NZ-FE 1.3L engine.

Do I need to bleed the cooling system after installing these hoses?

Yes, you must completely drain the system before removal and properly bleed all trapped air pockets upon refill to prevent hot spots in the 1NZ-FE cylinder head.

The Scion JDM Standard

Constructed for enduring JDM platform performance, this silicone coolant kit ensures stable heat dissipation and peace of mind on both daily commuter routes and spirited track runs.