BMW E81 / E82 / E87 / E88 1 Series, E90 / E91 / E92 / E93 3 Series & E84 X1 Lower Radiator to Thermostat Silicone Hose Repair Kit with Billet Aluminum Flange (N52N / N53 Engines / Replaces 17127564478)

Permanently solve the broken plastic radiator flange failure on your BMW N52N or N53 engine with this premium lower radiator hose repair kit, featuring a 6061 billet aluminum flange and triple-ply reinforced silicone hose for permanent durability and reliable cooling system sealing. The factory plastic radiator-to-thermostat flange is one of the most well-known weak points on N52N / N53-equipped BMW chassis — over time, the plastic flange becomes brittle from heat cycling and cracks or breaks entirely, causing coolant loss, overheating, and engine damage if not addressed promptly. This repair kit replaces the failure-prone plastic flange with rigid billet aluminum construction and upgrades the factory rubber hose to high-pressure (3-bar rated) triple-layer silicone with an anti-aging formula that maintains long-term flexibility without hardening, cracking, or developing the seal failures that affect aged factory hoses. Premium stainless steel hose clamps replace the inferior factory clamps for permanent leak-free sealing.

Features:

• 6061 billet aluminum flange – permanently eliminates the cracking and breakage failure mode of the factory plastic radiator flange
• Triple-ply reinforced silicone hose – high-pressure (3-bar rated) construction with anti-aging formula maintains long-term flexibility without hardening or cracking
• Upgraded stainless steel hose clamps – significantly more durable and reliable than the factory clamps which are not suitable for reuse after removal
• Direct OE replacement design – manufactured to factory specifications matching original equipment part number 17127564478 for clean, modification-free installation
• Anodized flange surface finish – delivers superior corrosion resistance and a clean professional aesthetic for long-term engine bay use
• High-temperature resistance – silicone construction maintains structural integrity under sustained engine operating temperatures where factory rubber hoses begin to degrade
• Aesthetic engine bay enhancement – customized silicone hose appearance elevates the engine bay beyond the cheap feel of factory rubber and plastic components

Specifications:

• Condition: 100% Brand New
• Type: Lower Radiator Hose Repair Kit (Radiator Bottom to Thermostat)
• Materials: 6061 Aluminum Alloy Flange, Triple-Ply Silicone Hose, Stainless Steel Clamps
• Hose Construction: Triple-Ply Reinforced Silicone
• Pressure Rating: 3 Bar (High Pressure)
• Surface Finish: Anodized (Aluminum Flange)
• Item Weight: 0.59 kg
• Quantity: Complete Kit (Flange + Hose + Clamps)
• Position: Hose from Radiator Bottom to Thermostat
• Engine Compatibility: BMW N52N / N53 Engines (NOT N51 / N52)
• Purpose: Direct Replacement / Performance Cooling System Upgrade

OE / Replacement Part Numbers:

• 17127564478 / 17 12 7 564 478

Fitment:

Critical engine code verification required – this kit fits N52N and N53 engines ONLY:

• Will NOT fit N51 engines (SULEV / California-spec versions)
• Will NOT fit N52 (non-N52N) engines
• Will NOT fit vehicles using OE part number 17 12 7 531 581 / 17127531581

US Market Fitment:

• BMW 1 Series E82 128i N52N (2006 – 2013) – Excludes N51 / N52
• BMW 1 Series E88 128i N52N (2006 – 2013) – Excludes N51 / N52
• BMW 3 Series E90 / E91 / E92 / E93 323i / 325i / 328i / 330i N52N / N53 (2005 – 2011) – Excludes N51 / N52

European Market Fitment:

• BMW 1 Series E81 130i N52N (2006 – 2010) – EUR Only, Excludes N51 / N52
• BMW 1 Series E82 125i N52N (2006 – 2013) – EUR Only, Excludes N51 / N52
• BMW 1 Series E87 LCI 130i N52N (2008 – 2012) – EUR Only, Excludes N51 / N52
• BMW 1 Series E88 125i N52N (2006 – 2013) – EUR Only, Excludes N51 / N52
• BMW 3 Series E90 / E91 / E92 / E93 323i / 325i / 328i / 330i N52N / N53 (2005 – 2011) – Excludes N51 / N52
• BMW X1 E84 25ix / 28ix N52 (2009 – 2011) – EUR Only

Contents:

• 1x 6061 Billet Aluminum Flange
• 1x Triple-Ply Reinforced Silicone Hose
• Stainless Steel Hose Clamps

Benefits:

• Permanently eliminates the broken plastic flange failure mode that plagues N52N / N53 BMW cooling systems – aluminum construction will not crack, become brittle, or fail under sustained heat cycling
• Triple-ply silicone hose delivers significantly higher pressure rating (3 bar) and temperature tolerance compared to factory rubber – critical for tuned vehicles or aging cooling systems
• Anti-aging silicone formula maintains long-term flexibility without hardening or cracking – eliminates the recurring service interval of replacing aged factory rubber hoses
• Stainless steel hose clamps deliver permanent corrosion-resistant clamping force – significantly more reliable than factory spring clamps which lose tension over time
• Resolves coolant leaks, overheating, and pressure loss symptoms commonly traced to failed factory plastic flanges and aged rubber hoses
• Significant cost savings compared to repeated dealer replacement of failure-prone plastic components – this kit is a one-time permanent solution
• Aesthetic engine bay upgrade – clean silicone hose and machined aluminum flange replace the bland factory components with a refined, motorsport-grade appearance
• Pairs naturally with other cooling system refresh components for comprehensive N52N / N53 cooling system upgrades

Installation Notes:

• Critical engine code verification: This kit fits N52N and N53 engines ONLY. It will NOT fit N51 (SULEV / California-spec), N52, or other engine variants. Verify your engine code before ordering – check the engine code stamp or consult vehicle service documentation
• Part number verification: This kit is NOT compatible with vehicles using factory part number 17 12 7 531 581. Confirm your factory part number is 17127564478 before ordering
• Allow the engine to fully cool and the cooling system to fully depressurize before beginning service to avoid scalding from hot coolant
• Drain the radiator coolant into a clean container before removing the factory hose – coolant can be reused if clean and within service life
• Carefully remove the factory plastic flange and hose – take note of original orientation and clamp positioning
• Inspect the radiator outlet, thermostat housing, and surrounding components during installation – replace any aged or damaged cooling system components for comprehensive system refresh
• Use the included stainless steel hose clamps with proper tightening torque – do not overtighten, which can damage the silicone hose, but ensure adequate clamping force for leak-free sealing
• Refill the cooling system with manufacturer-specified coolant type after installation – do not mix coolant types
• Bleed the cooling system thoroughly after installation to remove trapped air – follow factory bleed procedure for the N52N / N53 cooling system
• Check for leaks after the engine reaches operating temperature and cycles through the thermostat opening – inspect all connections and re-tighten clamps if needed
• Professional installation strongly recommended unless you have experience with BMW cooling system service procedures
• If unsure about compatibility with your specific BMW variant or engine code, contact our team with your year, model, chassis code, and engine code (must be N52N or N53) before ordering

Warranty:

• 12-month standard warranty from date of purchase
• Contact our support team for assistance with any issues