Trystan Casey
BMW has been using electric water pumps for some time now, with reports of pumps in the E60 5-series, the 2008 528i, and the 2007 X5 3.0. Electric water pumps were also available for the BMW 2002 and other '02 models. BMW has also used electric water pumps in conjunction with mechanical pumps in some B-series engines. While electric water pumps are more efficient, they are known to have a variable lifespan and are guaranteed to fail at some point.
| Characteristics | Values |
|---|---|
| Electric Water Pump Models | E60, E82, E90, E91, E92, F10, F11, F18, F25, F26, E70, F15, F85, E71, E72, Z4 E89, X3, Z4, X5, 328i, 323i, 128i, 528i |
| Year | 2007, 2008 |
| Mileage | 250,000 miles, 120,000 km |
| Lifespan | Variable |
| Failure Causes | Electronics failures, engine belts, weight, wiring problems, engine damage |
| Failure Rate | High initial failure rate |
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What You'll Learn
BMW E60 5-Series Electric Water Pump Testing
BMW E60 5-Series owners may encounter issues with their electric water pumps, leading to engine overheating. Testing the electric water pump involves several steps, which are outlined below:
Identifying the Issue
When experiencing engine overheating, the first step is to check the Digital Motor Electronics (DME) for fault codes. This is done by connecting a scan tool, such as a BMW scan tool, to the vehicle's diagnostic port. Fault codes related to the electric coolant pump will indicate issues with the pump's performance, such as a lower-than-desired speed.
Checking the Pump
If fault codes point to the electric coolant pump, further testing is required. It is recommended to check the wiring to the pump and confirm that there are no loose connections or damage. Additionally, the pump's operation can be observed by monitoring its RPM while the engine is running. If the pump runs at maximum RPM and does not follow ECM speeds, it is likely faulty.
Common Causes
The most common causes of electric coolant pump issues include a broken impeller, a seized motor, or faulty wiring. In some cases, the pump may need to be removed and replaced if it is found to be faulty. When removing the pump, it is important to store it with coolant inside to prevent corrosion.
Additional Considerations
When working on the cooling system, always allow the engine to cool down before proceeding. Additionally, it is important to note that different size fasteners may have been used during previous services, so it is recommended to refer to the vehicle's specific wiring diagrams and service information.
Windshield Washer Pump Testing
It is also worth noting that the BMW E60 5-Series (2003-2010) may experience issues with the windshield washer pump. Testing this pump involves connecting a test light or a Digital Volt-Ohm Meter (DVOM) across the washer pump electrical connector terminals. By pressing the washer button, the test light should illuminate, and the DVOM should read the battery volts.
When testing and repairing the vehicle, it is crucial to prioritize safety. Always disconnect the battery before working on any electrical systems, and ensure that fluids, dust, and debris are properly contained and disposed of.
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BMW M3 Forum (E90 E92)
There is no clear consensus on which year BMW has an electric water pump. However, one source mentions that the BMW 3-Series (E90 E92) has an electric water pump that can be tested for power using a scan tool. The pump is powered by 12V at pin 1 and grounded at pin 3 or 4, depending on the model year.
Another source mentions that the N52 engine in the BMW 3-Series (E90 E92) is known for its reliable water pumps, although the thermostat is more likely to cause issues.
Some owners of the BMW 3-Series (E90 E92) have experienced issues with their water pumps failing prematurely, with some reporting multiple pump failures before 100,000 miles. It is unclear whether these issues are specific to certain model years or production batches.
One owner suspects that BMW may have corrected a design flaw in the water pump, leading to improved reliability in 2010 and later models. This improvement may also be present in some 2007-2009 models that received a replacement pump under warranty.
When considering a water pump upgrade or replacement, it is recommended to seek out the newest pump design available to avoid receiving an older, potentially flawed pump from BMW dealers or suppliers.
To extend the lifespan of the water pump, some owners have suggested adding a naca duct near the pump to direct airflow and improve cooling. Regular scanning of the vehicle using a BT scan tool can also help identify potential issues with the water pump before it fails.
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BMW B-series engine
BMW has been producing engines for automobiles, motorcycles, and aircraft since 1917. The company is well known for its history of inline-six (straight-six) engines, a layout it continues to use to this day, along with inline-four and V8 layouts.
The BMW B58 is a turbocharged straight-six engine that began production in 2015. The B58 replaced the N55 and was launched in the F30 340i. The engine is part of BMW's modular engine family, with each engine using a displacement of 500 cc per cylinder. The B58 engine was named to Ward's World's 10 Best Engines four times between 2016 and 2020.
The S58 engine is the high-performance version of the B58 engine. It was introduced in the F97 X3 M and F98 X4 M, marking the first time a stand-alone M model was produced for these series. The S58 features twin mono-scroll turbochargers, a compression ratio of 9.3:1, and a redline at 7,200 rpm. It also has a forged chrome molybdenum heat-treated steel crankshaft and forged steel connecting rods. Like the B58, the S58 features direct fuel injection, variable valve timing (called double VANOS by BMW), and variable valve lift (called Valvetronic).
The B-series engines have primary mechanical pumps regardless of fuel type but still retain auxiliary electric pumps. The mechanical pump moves the coolant through the engine circuit, while the electric pump circulates water to the air intercooler.
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BMW X5 3.0 2007
The BMW X5 3.0 2007 model features an electric water pump. Electric water pumps are standard on BMW gasoline engines, and the X5 3.0 is no exception.
While electric water pumps are more efficient than their mechanical counterparts, they are also prone to failure. This can be due to electronics failures or issues with the bearings. Given the variable lifespan of electric water pumps, preventative replacement may not be the best course of action. However, if your vehicle has over 100k miles on the stock pump, it is recommended to replace it.
If you are considering replacing the water pump on your BMW X5 3.0 2007, it is important to note that the process is time-consuming. You will need to remove a lot of components to access the water pump, and it is recommended to take video notes to ensure proper reassembly. Additionally, it is suggested to replace the thermostat, the "U" hose, and the coolant pipe gasket at the same time, as they will need to be removed anyway.
The cost of repairing or replacing the water pump on a BMW X5 3.0 can be significant, with one owner reporting a cost of $1397 for a replacement at 44k miles.
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BMW 3.0L L6 Turbo
The BMW 3.0L L6 Turbo engine, also known as the N54/N55-B30A engine, is a powerful and popular engine option for various BMW models. This engine is renowned for its performance and efficiency, and an electric water pump plays a crucial role in maintaining its optimal operation.
The electric water pump in the BMW 3.0L L6 Turbo engine is specifically designed to address the cooling challenges associated with turbocharged engines. The N54 and N55 engines have reduced cooling areas due to the factory intercooler and tight space under the hood. BMW introduced a dynamic and 'smart' electric water pump to overcome these issues.
This electric water pump is not your typical mechanical water pump. It is electrically driven and varies its output based on instructions from the engine computer. This means that the pump delivers only as much coolant as needed, and it can shut down or activate in response to changing load and performance demands. One of its advantages is the ability to run even when the car is turned off, reducing heat soak in the engine and the turbocharger.
The electric water pump for the BMW 3.0L L6 Turbo engine is compatible with a range of BMW models, including the 135i, 335i, 535i, 640i, 740i, X3, X5, and Z4. It is important to note that the specific compatibility may vary depending on the model year and other factors. For example, the VIPCAR 01106E Electric Water Pump is designed for BMW 3.0L L6 Turbo engines from 2007 to 2017.
In addition to the electric water pump, BMW has also implemented other strategies to manage the cooling demands of the N54/N55 engines. The water pump itself has more cooling responsibilities than its predecessors, not only cooling the engine but also playing a role in cooling the turbocharger oil and automatic transmission oil.
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Frequently asked questions
No, all BMW diesel engines have mechanical water pumps, while gasoline engines have electric water pumps.
BMW models with electric water pumps include the 2007 X5 3.0, 2008 528i, 2008 535i, 328i, 323i, 325i, 328i, 528i, 335i, and the M3.
The lifespan of BMW electric water pumps is variable. Some users have reported that their electric water pumps lasted 250,000 miles, while others have had to replace them after 40,000 miles.
If your BMW electric water pump is faulty, you may notice issues with the car's performance or unusual scanner readings. You can also test the pump to determine if it is faulty.
BMW electric water pumps are more efficient than mechanical water pumps because they are not run by the engine belts, so they don't bog down the engine. However, electric water pumps are more likely to fail due to electronics failures.
