News

The Short Version

Factory radiators on the 2005–2007 Ford F-250 and F-350 Super Duty use plastic tanks crimped onto an aluminum core. That crimp joint is the documented failure point, typically cracking between 120,000 and 160,000 miles.

The Aluminum Radiator for 2005–2007 Ford F-250/F-350 Super Duty replaces the OEM plastic-tank unit (Ford engineering ID: 5C3Z-8005) with fully TIG-welded, all-aluminum construction. Heat dissipation runs approximately 40% faster than the factory plastic-aluminum hybrid.

It fits both the 6.0L Power Stroke Turbo-Diesel V8 and the 6.8L Triton V10. It is engineered to SAE J1994-2026 laboratory testing standards for vehicle heat exchangers, runs Ford WSS-M97B57-A2 antifreeze, and carries the transmission cooler circuit on M18 × 1.5 threaded fittings. As a single recyclable alloy, it aligns with the 2026 EPA aftermarket sustainability guidelines.

Why the Factory Unit Fails

Thermal cycling works the plastic tank-to-aluminum header crimp joint until it stress-fractures. PA66-GF30 glass-filled nylon and aluminum expand at different rates, so the joint fatigues cycle after cycle — usually letting go somewhere between 120,000 and 160,000 miles.

The Koeep unit removes that failure vector entirely with 100% furnace-brazed aluminum construction. Tanks, core, and hose connections are all aluminum. There is no crimped plastic joint left to crack.

Four Signs the Tank Is About to Let Go

• Stress whitening — hazing or micro-cracking where the upper hose neck meets the PA66-GF30 tank body.
• Coolant crystallization — white or pink deposits at the tank-to-core crimp perimeter.
• Intermittent coolant odor with no puddling — the classic hot smell that precedes a blowout.
• Slow coolant loss — 4–8 oz per 500 miles with no visible external leak.

See any one of these and replace the radiator before it dumps coolant at highway speed. The all-aluminum unit eliminates all four failure modes.

Inside the Build

Alloys and Brazing

The core uses AA3003-series aluminum with AA4343 cladding for the braze, giving approximately 110 MPa tensile strength post-braze. Corrosion resistance is validated to ASTM G85-A5 cyclic acidified salt fog testing.

Tube-to-fin bonding uses Nocolok® fluxless brazing in a controlled-atmosphere furnace (CAB), which eliminates residual flux corrosion risks. Production follows IATF 16949:2026 quality management benchmarks for automotive thermal management components.

Thermal Numbers

The 2-row core runs 1″ oversized tubes against the OEM single row of 5/8″–3/4″ tubes, paired with corrugated multi-louver fins at 14–16 FPI. Estimated heat rejection: 140,000–155,000 BTU/hr at 55 mph ram air — roughly a 28–32% improvement over the OEM single-row design.

If you tow with the 6.0L Power Stroke, that margin matters. Sustained coolant temps above 220°F accelerate EGR cooler and head gasket degradation, and elevated EGTs push a tired OEM core right to its limit.

DTC Mapping for Your Scan Tool

This is passive cooling hardware with no electronics on board, so 2026 CAN-bus 3.0 diagnostics are unaffected. Every cooling DTC stays ECU-readable via the SAE J1939/J1979 protocols on both engines, model years 2005–2007.

• P0115–P0119 — ECT Sensor Circuit
• P0128 — Coolant Temp Below Regulating Temp
• P0217 — Engine Coolant Over Temperature
• P0480–P0483 — Fan Control Circuit (cooling demand side)
• P0528 — Fan Speed Sensor No Signal
• P1299 — Cylinder Head Over Temperature Protection Active

The added thermal capacity directly cuts P0217 and P1299 recurrence: peak coolant temperature under load drops an estimated 8–14°F versus an aged OEM unit. Burst pressure is rated to ≥160 psi, well past the OEM 120 psi spec.

Full Specification Table

Every number below comes straight from the product engineering data.

Fitment: Will It Bolt Straight In?

Yes. Ford kept the radiator mounting architecture consistent across the entire 2005–2007 production run, so late-2007 production changes are a non-issue. Trucks with the factory heavy-duty cooling package or snow-plow prep package are fully compatible.

One check before ordering: 2005 models came with two different lower hose diameters, so measure your existing lower radiator neck. This unit is configured for the more common 1.75″ upper / 2.0″ lower hose setup and installs as a direct bolt-in — no fabrication, no core support modification, no hose adapters.

Frequently Asked Questions

Fleet Pricing or Fitment Questions?

Our parts team answers technical questions before you buy and after the radiator is on the truck. Reach out any of these ways:

• Submit the request for quote form for fleet pricing and bulk orders.
• Email support@koeep.com with your VIN or existing part number for a fitment check.
• Message the team on WhatsApp for the fastest reply.