Radiator for Scion xA xB (2004-2006) 1.5L

Direct-Fit Replacement Radiator for 2004-2006 Scion xA,xB (XP20 / XP30)

What it Does: The replacement radiator restores peak engine cooling efficiency on the 2004-2006 Scion xA and xB to prevent overheating and maintain consistent operating temperatures under stop-and-go driving conditions.

The Stock Scion xA,xB Thermal Fatigue & Sealing Breakdown

The factory cooling system on the XP20 and XP30 platforms relies on a composite core assembly that is prone to age-related degradation. Over years of thermal cycling, the factory PA66 plastic end tanks become brittle, developing microscopic stress fractures near the crimped header plate seam and upper radiator hose inlet. Furthermore, corrosion, road debris, and internal scale buildup clog the delicate single-pass channels of the stock 1NZ-FE heat exchanger. Once thermal dissipation degrades, localized hot spots accelerate head gasket wear and cause coolant blow-by during prolonged idle or high ambient load.

The Engineering Solution

This replacement heat exchanger features a brazed aluminum core engineered with high-density louvered fin architecture to maximize heat transfer efficiency and surface-area contact. Reinforced heavy-duty composite end tanks are secured with multi-point crimped perimeter joints and high-durometer seals to resist high-pressure spikes and thermal shock. Engineered to exact OEM dimensional tolerances, it includes factory-matched port locations, mounting pins, and transmission cooler provisions for direct drop-in integration without clearance modifications.

What's Included

• 1 Radiator

Technical Specifications

Compatibility

• 2004-2006 Scion xA 1.5L 4-cylinder
• 2004-2006 Scion xB 1.5L 4-cylinder

Frequently Asked Questions & Fitment Warnings

Does this fit the XP20 / XP30 xA,xB?

Yes, this is a direct fit for the 2004-2006 Scion xA,xB equipped with the 1NZ-FE engine.

Do I need to bleed the system after installation?

Yes, refilling with factory-specified coolant and fully burping the cooling system of trapped air pockets is mandatory to prevent thermal airlocks and irregular thermostat cycling.

The Scion Reliability Caliber

Engineered for high-mileage urban dependability, this radiator ensures reliable thermal stability so your compact JDM platform maintains optimum operating performance across daily commuting duty cycles.