GZGN Electric Engine Water Pump & Thermostat Kit for BMW N51/N52 – Aluminum Housing, Direct-Fit

GZGN’s electric engine water pump and aluminum thermostat kit replaces worn cooling components on BMW N51/N52 engines to restore reliable coolant circulation and temperature control.

Designed as a direct-fit replacement for a range of BMW 3, 5, X3, X5 and Z4 models, this kit pairs an electric-driven water pump with an aluminum thermostat and wiring harness so you get compatible hardware and fast installation. The assembly uses an aluminum housing, plastic impeller and comes with mounting bolts and a pre-wired connector to simplify swapping parts. OEM cross-reference numbers include 11517586925 for the pump and 11537549476 for the thermostat, among other factory part numbers — check the model table to confirm fitment to your year and engine.

Which BMW models and engines does this kit fit?

This GZGN kit is built for BMW vehicles using the N51 and N52 engines. It covers many common 128i, 323i, 325i, 328i, 330i, 528i, 530i, X3, X5 and Z4 model years; exact compatibility depends on year and drivetrain configuration (xDrive or xi).

• Fits N51 & N52 engines in 128i (2008–2013) and 328i (2007–2013) variants
• Compatible with select 323i, 325i, 330i, 528i, 530i model years listed in the fitment table
• Includes hardware for a direct-replacement installation on compatible models

What components are included and what are their materials?

The kit ships with the electric water pump, an aluminum thermostat, a wiring harness and three mounting bolts. The pump housing is aluminum for strength and heat conduction while the impeller is molded plastic to maintain flow efficiency and resist corrosion.

• One electric water pump with aluminum housing and plastic impeller
• One aluminum thermostat sized for direct fit
• Pre-assembled wiring harness and three mounting bolts for installation

How does installation and fitment work for this replacement kit?

GZGN supplies a direct-replacement design intended to match OE mounting points and electrical connections, minimizing modification. For proper operation, confirm your vehicle’s engine code and part cross-reference numbers before purchase and follow factory torque and coolant-bleeding procedures during installation.

• Direct replacement fitment intended for bolt-on installation on listed models
• Wiring harness designed to mate with original connectors—verify pin compatibility
• Follow manufacturer coolant fill and bleed instructions after installation

What kind of testing and support does GZGN provide?

Before shipping, units undergo balance and leak checks to reduce the risk of early failure. GZGN backs this kit with a one-year warranty and offers online customer support for fitment and troubleshooting questions.

• Balance and leakage testing performed prior to dispatch
• One-year limited warranty included with purchase
• 24-hour customer support for installation or compatibility inquiries

Who is this for? This GZGN electric water pump and aluminum thermostat kit is intended for DIY mechanics, independent shops and BMW owners who need a direct-replacement cooling component for N51/N52 engines. If your vehicle shows signs of cooling system wear, erratic temperature readings, or you’re restoring a high-mileage BMW model from the fitment list, this kit provides the core parts and hardware needed for a standard replacement. Always verify your engine code and OEM part numbers (for example, 11517586925 and 11537549476) against the vehicle before ordering to ensure compatibility.