BMW Thermostat Housing Coolant Water Pump Outlet Replacement – Restores Cooling System Performance – E46 E39 E53 E83 Z3 Z4 323Ci 325i / 11531437040

Restore proper coolant circulation and maintain reliable engine operating temperatures with this OEM-style Thermostat Housing Coolant Water Pump Outlet replacement for select BMW models. Designed to replace the factory coolant outlet connection between the water pump, thermostat housing, and surrounding cooling system components, this part helps ensure efficient coolant flow throughout the engine cooling system.

BMW cooling systems are exposed to constant heat cycles, pressure fluctuations, and long-term coolant contact. Over time, factory coolant outlets and thermostat housing connections can become brittle, crack, warp, or begin to leak, resulting in coolant loss, overheating concerns, and reduced cooling system efficiency. Replacing worn cooling system components before they fail is an important preventative maintenance step that helps protect the engine from more expensive damage.

Manufactured from durable automotive-grade materials, this replacement coolant outlet is built to withstand demanding operating temperatures and cooling system pressure. The precision-molded design helps ensure OEM-style fitment and secure sealing for dependable, leak-resistant performance.

Whether you are repairing a coolant leak, replacing a failed outlet connection, or refreshing an aging cooling system, this direct-fit replacement helps restore factory cooling system operation and long-term reliability without requiring modifications.

Key Features:

• Direct OEM Replacement: Designed to replace the factory thermostat housing coolant water pump outlet on compatible BMW applications.
• Connects Thermostat Housing and Water Pump Cooling Components: Helps maintain proper coolant routing through a critical area of the cooling system.
• Restores Proper Coolant Circulation: Supports stable coolant flow and dependable cooling system efficiency.
• Helps Prevent Leaks and Overheating: Replacing a worn outlet can help reduce the risk of coolant loss and temperature-related engine issues.
• Maintains Stable Engine Operating Temperatures: Helps the cooling system function properly under normal and demanding driving conditions.
• Heat- and Pressure-Resistant Construction: Built to withstand repeated thermal cycling and cooling system stress.
• Precision-Molded OEM-Style Fitment: Designed to match the original installation layout for secure fitment and proper sealing.
• Ideal for Repairs and Preventative Maintenance: A smart replacement when refreshing aging cooling system 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 thermostat housing coolant water pump 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.