Electric Water Pump - Pierburg (7.03665.66.0)
Pierburg part # 7.03665.66.0
At BMW, PIERBURG was the first global series-production supplier for electrical coolant pumps. Requirement-based cooling of the engine enables the fuel consumption to be reduced by around two to three percent, which also reduces emissions and friction. The main application areas are the indirect charge air cooling of supercharged combustion engines. Even in the drive concepts of hybrid and electric vehicles, the pumps are used for a variety of cooling functions such as the cooling of batteries, DC/DC converters, and power electronics.
Since 1996, Pierburg has held a leading market position with its electronic water circulating pumps. Water circulating pumps are fitted with an electric motor and mounted decentrally on the engine. They are used in situations where cooling and heating functions need to be implemented independently of the engine coolant circuit, for example the heating support, the residual heat extraction, and in pre-heating systems.
Technical information
- Heat is produced through combustion in the engine. The cooling liquid absorbs the heat from the engine block and cylinder head and releases this into the ambient air via the radiator. The water pump circulates the cooling liquid in the closed cooling system. Once optimum temperatures have been achieved, the engine is provided with operating conditions that have a high level of efficiency, complete combustion, and reduced emissions values. Mechanical water pumps are driven by either V-belts, flat belts, or toothed belts depending on the installation location on the vehicle – with a fixed connection to the engine speed. The pumps are designed to ensure sufficient cooling, even at low engine speeds with a high load and high ambient temperatures. This means that they are overdesigned for normal operation (at a higher engine speed and low load).
- The use of the electrical coolant pump in combination with modern thermal management of the combustion engine has measurable advantages. The requirement-based cooling results in fuel saving (approx. 3%) and a corresponding reduction of exhaust emissions, particularly during the cold start phase. Furthermore, improved air conditioning means that it is possible to achieve a greater level of comfort in the passenger compartment. Electrical water circulating pumps and coolant pumps are available in power outputs of 15 W to 400 W.
Diagnostic information
- Mechanical water pumps: Typical damage includes: faulty bearings, noise resulting from a faulty bearing, loose impellers, and leakages. The pumps are sealed using a so-called sliding ring seal. Due to their special design, sliding ring seals are never completely watertight. A small amount of water always escapes in between the sliding surfaces of the sealing material onto the pressure-less side of the seal and evaporates there. Traces of condensation without a noticeable loss of coolant are an ordinary phenomenon in coolant pumps. The water that escapes from a new pump in the form of a few drops is lost in the initial hours of operation. Sliding ring seals need some time to wear in.
- Electrical coolant pumps CWA 50 – CWA 400: Electrical coolant pumps have various integrated protective mechanisms. If one of these mechanisms is activated, for example due to overvoltage, dry running or if the pump becomes jammed, a diagnostic trouble code can be stored in the vehicle control unit. Since a number of different sensors and actuators may influence the malfunctions in controlled pumps, we recommend that you consult the vehicle-specific test instructions of the vehicle manufacturer.
- General cooling system: In order to prevent corrosion damage and cavitation in the cooling system, it is absolutely necessary that the anti-freeze mixture prescribed by the vehicle manufacturer be used in the specified mixing ratio.
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Product Details
Installation GuideDescription
At BMW, PIERBURG was the first global series-production supplier for electrical coolant pumps. Requirement-based cooling of the engine enables the fuel consumption to be reduced by around two to three percent, which also reduces emissions and friction. The main application areas are the indirect charge air cooling of supercharged combustion engines. Even in the drive concepts of hybrid and electric vehicles, the pumps are used for a variety of cooling functions such as the cooling of batteries, DC/DC converters, and power electronics.
Since 1996, Pierburg has held a leading market position with its electronic water circulating pumps. Water circulating pumps are fitted with an electric motor and mounted decentrally on the engine. They are used in situations where cooling and heating functions need to be implemented independently of the engine coolant circuit, for example the heating support, the residual heat extraction, and in pre-heating systems.
Technical information
- Heat is produced through combustion in the engine. The cooling liquid absorbs the heat from the engine block and cylinder head and releases this into the ambient air via the radiator. The water pump circulates the cooling liquid in the closed cooling system. Once optimum temperatures have been achieved, the engine is provided with operating conditions that have a high level of efficiency, complete combustion, and reduced emissions values. Mechanical water pumps are driven by either V-belts, flat belts, or toothed belts depending on the installation location on the vehicle – with a fixed connection to the engine speed. The pumps are designed to ensure sufficient cooling, even at low engine speeds with a high load and high ambient temperatures. This means that they are overdesigned for normal operation (at a higher engine speed and low load).
- The use of the electrical coolant pump in combination with modern thermal management of the combustion engine has measurable advantages. The requirement-based cooling results in fuel saving (approx. 3%) and a corresponding reduction of exhaust emissions, particularly during the cold start phase. Furthermore, improved air conditioning means that it is possible to achieve a greater level of comfort in the passenger compartment. Electrical water circulating pumps and coolant pumps are available in power outputs of 15 W to 400 W.
Diagnostic information
- Mechanical water pumps: Typical damage includes: faulty bearings, noise resulting from a faulty bearing, loose impellers, and leakages. The pumps are sealed using a so-called sliding ring seal. Due to their special design, sliding ring seals are never completely watertight. A small amount of water always escapes in between the sliding surfaces of the sealing material onto the pressure-less side of the seal and evaporates there. Traces of condensation without a noticeable loss of coolant are an ordinary phenomenon in coolant pumps. The water that escapes from a new pump in the form of a few drops is lost in the initial hours of operation. Sliding ring seals need some time to wear in.
- Electrical coolant pumps CWA 50 – CWA 400: Electrical coolant pumps have various integrated protective mechanisms. If one of these mechanisms is activated, for example due to overvoltage, dry running or if the pump becomes jammed, a diagnostic trouble code can be stored in the vehicle control unit. Since a number of different sensors and actuators may influence the malfunctions in controlled pumps, we recommend that you consult the vehicle-specific test instructions of the vehicle manufacturer.
- General cooling system: In order to prevent corrosion damage and cavitation in the cooling system, it is absolutely necessary that the anti-freeze mixture prescribed by the vehicle manufacturer be used in the specified mixing ratio.
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Shipping Policy
At Restauco Parts, we ship to the 48 contiguous U.S. states and Puerto Rico. Every order ships from our supplier's authorized warehouses located in the United States. At this time we do not ship to Alaska, Hawaii, the U.S. Virgin Islands, Guam or other U.S. territories.
When will my order be processed?
Orders are processed Monday through Friday. You will receive a tracking number by email once your order has shipped. Weekend orders will be processed the next business day.
How long will it take to receive my order?
Delivery time depends on the carrier and your location. Oversized shipments may require additional time — you will be contacted prior to shipping for approval.
Which carriers do you use?
We ship via UPS, FedEx, and USPS depending on the size, weight, and destination of your order. The most appropriate carrier will be selected at the time of fulfillment. Carrier substitutions may be made to reduce shipping costs to the customer.
Do you ship internationally?
We do not ship internationally. We ship within the 48 contiguous U.S. states and Puerto Rico.
VIN Requirement
We strive for 100% accuracy on all orders. To help us achieve this goal, we ask that you include your car's VIN when placing your order. This is a courtesy service to help avoid wrong part orders and returns. We are not responsible for 100% guaranteed fitment.
Backordered or Discontinued Parts
In the unlikely event that a part has been placed on backorder or discontinued, we will do our best to find it for you as quickly as possible.
Questions?
If you have any questions about your shipment, please contact us at [email protected]
Return Policy
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You'll also need the receipt or proof of purchase. To start a return, you can contact us at [email protected] Please note that returns can be made to several branches, contact us to provide thhe correct information.
If your return is accepted, the refund will be processed between 3-4 business day once we receive the item. Items sent back to us without first requesting a return will not be accepted. NOTE: We don't make refund for shipping cost. You can always contact us for any return question at [email protected].
Damages and Issues
Please inspect your order upon receipt and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Refunds
We will notify you once we've received and inspected your return, and let you know if the refund was approved or not. If approved, you'll be automatically refunded on your original payment method within 10 business days (excluding shipping cost). Please remember it can take some time for your bank or credit card company to process and post the refund too. If more than 15 business days have passed since we’ve approved your return, please contact us at [email protected].
Pierburg
Pierburg German-engineered fuel and emission system components deliver precise engine management for European and domestic vehicles. Shop Pierburg at Restauco for fuel pumps, EGR valves, intake manifold actuators, and vacuum pumps built to OEM standards. Buy Pierburg engine management parts online across all 50 states for factory-level performance and emissions compliance. Order from Restauco with fast nationwide shipping.
Restauco Parts is your trusted online source for genuine OEM and premium aftermarket auto parts. We carry top brands including ACDelco, GM Genuine Parts, Motorcraft, Dorman, Akebono, Wagner, and Bilstein. Whether you need brake pads, suspension parts, ignition coils, fuel pumps, or engine components, we offer competitive prices and fast shipping on thousands of parts for all major makes and models. Shop with confidence — every part we sell meets or exceeds OEM quality standards.