BMW S900778 Coolant Water Pump Thermostat 645CI 4.4L V8 133K 5078

( Manufacturer Part Number: S900778 ), ( Type: Coolant Water Pump Thermostat ), ( Manufacturer Warranty: 1 Month ), ( Oe/oem Part Number: 162778 ), ( Vintage Part: No ), ( Country Of Origin: Germany )

Review BMW 645ci Oem 4.4l V8 Coolant Water Pump Thermostat 133k fits 745LI 545I 2002–2006

Introducing the BMW S900778 02-06 745li, 645ci, 545i, 4.4L V8 Coolant Water Pump and Thermostat, a crucial component for maintaining optimal engine temperature and cooling in your BMW 7 Series or 5 Series vehicle with a 4.4L V8 engine produced between 2002 and 2006.

This BMW original equipment (OE) thermostat and water pump combination is a direct replacement for the original part, ensuring perfect fit and function. The thermostat is designed to regulate the coolant temperature by opening and closing according to engine temperature, while the water pump is responsible for circulating coolant throughout the engine.

Made from high-quality materials, this BMW thermostat and water pump are built to last. The thermostat housing is made from durable plastic, while the internal thermostat mechanism is made from temperature-resistant materials. The water pump features a robust design with a strong impeller and a sturdy housing to ensure reliable operation.

The BMW S900778 02-06 745li, 645ci, 545i, 4.4L V8 Coolant Water Pump and Thermostat is suitable for vehicles with approximately 133,000 kilometers (or 83,000 miles) on the odometer. If your vehicle falls within this range and you've been experiencing issues with engine temperature or cooling, this BMW OE part is the solution.

Installing this thermostat and water pump is a straightforward process, making it an excellent choice for DIY enthusiasts or those who prefer to save on labor costs. With clear installation instructions and readily available parts, you can complete the replacement in the comfort of your own garage.

Investing in a BMW S900778 02-06 745li, 645ci, 545i, 4.4L V8 Coolant Water Pump and Thermostat ensures that your BMW continues to perform at its best. Don't let a faulty thermostat or water pump compromise the reliability and efficiency of your vehicle. Replace it with the genuine BMW part today.

BMW 7 Series (S900778) 4.4L V8 Coolant Water Pump and Thermostat: Pros, Cons, and Conclusion

The BMW 7 Series (S900778) 4.4L V8 Coolant Water Pump and Thermostat, with part number 5078, is a crucial component in maintaining the cooling system of BMW 745Li, 645Ci, and 545i models produced between 2002 and 2006. In this analysis, we will discuss the advantages and disadvantages of purchasing this part, followed by a concluding recommendation.

1. OEM (Original Equipment Manufacturer) part: The BMW S900778 5078 water pump and thermostat are designed and manufactured by BMW, ensuring a perfect fit and compatibility with the vehicle.

2. Long-lasting: BMW components are known for their durability and high performance. This cooling system component can last for a long time, providing reliable cooling to the engine.

3. Enhances engine performance: A well-functioning water pump and thermostat ensure that the engine stays at optimal temperature, which is crucial for its longevity and performance.

4. Reduces the risk of engine damage: A faulty water pump or thermostat can lead to overheating, which can damage the engine. Replacing these parts with genuine BMW components helps prevent such issues.

1. Cost: Original BMW parts tend to be more expensive compared to aftermarket alternatives. This can be a significant disadvantage for budget-conscious consumers.

2. Availability: BMW parts may not be readily available at local auto parts stores, requiring customers to order them online or from dealerships.

3. Installation: Installing the water pump and thermostat can be a complex process, especially for those without automotive experience. It may be necessary to hire a professional mechanic for installation.

The BMW S900778 5078 Coolant Water Pump and Thermostat is a vital component for maintaining the cooling system of BMW 745Li, 645Ci, and 545i models. While its high cost and potential installation challenges may be disadvantages, the benefits of using genuine BMW parts, such as reliability, compatibility, and long-lasting performance, often outweigh these concerns. Ultimately, the decision to purchase this part depends on your budget, availability, and technical expertise. If you prioritize originality, compatibility, and peace of mind, then investing in a BMW OEM water pump and thermostat is a sound choice.

Details:

Mileage: 133,250 miles. About Item: Better to see something once than hear about it a thousand times. This item came From: 2004 BMW 745Li, Sedan 4-Dr. 6-Speed Automatic Transmission AT ; Rear Wheel Drive RWD.

part #: s900778 prices

• $79.87-$152.00

specifications theostapa:

• for models: 745li, 545i
• for makes: Bmw
• for years: 2002-2006
• mpn: S900778
• type: Coolant Water Pump Thermostat
• manufacturer warranty: 1 Month
• oe/oem part number: 162778
• vintage part: No
• country of origin: Germany

shipping theostapa:

• cost: $39.00
• class: Standard
• service: Standard
• type: Fixed
• transit: 3-7 Days

seller theostapa:

• # reviews: 11103
• city: Euclid, Ohio
• rating: 99.8%

offer theostapa:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• best offers: True
• quantity: 1
• started: March 9, 2026

general theostapa:

• Car Truck Parts Accessories > Engine Cooling Components > Thermostats Housings
• condition: Used

returns theostapa:

• time: 30 Days
• policy: Returns Accepted
• paid by: Seller

payments theostapa:

• credit card: Diners-club
• other
• wallet: Apple-pay

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