BMW Upgraded Full Metal Thermostat Housing Coolant Water Pump Outlet – Reinforced Cooling System Replacement for E46, E39, E53, E83, Z3 & Z4 Models | Replaces Part No. 11531437040

Restore proper coolant circulation and upgrade one of the more failure-prone factory cooling system components with this Upgraded Full Metal Thermostat Housing Coolant Water Pump Outlet for select BMW models. Designed to replace the original outlet connection between the water pump, thermostat housing, and surrounding cooling system components, this reinforced version provides a much stronger and more durable solution than the factory-style plastic design.

On many aging BMW cooling systems, the original plastic outlet can become brittle over time from repeated heat cycles, coolant pressure, and long-term engine bay exposure. Once that happens, it can crack, warp, or begin leaking without much warning, leading to coolant loss, overheating concerns, and potentially expensive engine damage. Replacing that weak point with a full metal design is a smart preventative maintenance upgrade for long-term reliability.

Unlike the standard plastic-style outlet, this upgraded version is built from metal for significantly improved strength and durability in a critical cooling system junction. The full metal construction is designed to better withstand heat, pressure, and aging, helping reduce the risk of cracking or failure over time. It is an ideal solution for BMW owners who want a more confidence-inspiring replacement rather than installing another plastic part that may eventually suffer the same issue.

Whether you are repairing a coolant leak, refreshing your cooling system, or proactively upgrading known weak points in the engine bay, this full metal thermostat housing water pump outlet helps restore factory cooling system function while offering improved long-term durability and peace of mind.

Key Features:

Full Metal Design: Upgraded all-metal construction provides significantly greater strength and durability than the original plastic-style outlet.

Reinforced Cooling System Upgrade: Replaces a common weak point in the factory cooling system with a stronger, more reliable solution.

Built to Better Resist Cracking: Designed to better withstand repeated heat cycles, coolant pressure, and long-term engine bay stress.

Restores Proper Coolant Circulation: Helps maintain stable coolant flow between the thermostat housing, water pump, and cooling system.

Helps Prevent Leaks and Overheating: Replacing a weakened factory outlet can help reduce the risk of coolant loss and temperature-related engine issues.

OEM-Style Fitment: Designed to install in the factory location for clean fitment and dependable sealing.

Ideal for Repairs and Preventative Maintenance: A smart upgrade when servicing the cooling system or replacing brittle factory plastic components.

FITMENT:

• BMW 3 Series – E46 Sedan, Coupe, Touring, Convertible
  Compatible with 323Ci Coupe (1999–2000), 323i Sedan (1999–2000), 325Ci Coupe / Convertible (2001–2006), and 325i Sedan / Touring (2001–2006).
• BMW 5 Series – E39 Sedan, Touring
  Compatible with 525i Sedan / Touring (2001–2003) and 530i Sedan / Touring (2001–2003).
• BMW X3 – E83 SUV
  Compatible with X3 2.5i and X3 3.0i models.
• BMW X5 – E53 SUV
  Compatible with X5 3.0i models.
• BMW Z3 – Roadster, Coupe
  Compatible with Z3 2.5i, 2.8i, and 3.0i models.
• BMW Z4 – E85 Roadster, E86 Coupe
  Compatible with Z4 2.5i, 3.0i, and Z4 Coupe 3.0si models.

Engine compatibility:
M52TU inline-6 engines
M54 inline-6 engines

If you’re unsure whether this upgraded full metal outlet fits your specific vehicle, please contact us with your VIN and we’ll be happy to verify compatibility before you order.

Replaces Part No. 11531437040

Please refer to the “Fitment” section in the product description for compatibility details.