Engines with electric auxiliary pumps become more efficient, as they generate less excess heat and oil consumption. Even though not all vehicles have one yet, these pumps are growingly popular in modern, low-emission and high-output engines that have to run within a small temperature range in order to maintain their efficiency.

The usefulness of an auxiliary electric water pump

So, what is an auxiliary water pump? It is a secondary pump that plays a crucial role in maintaining engine efficiency and passenger comfort. These pumps can send hot coolant into the heater core regardless of the engine’s RPMs, providing hot/cold air to the cabin even when the engine is idling or off. The auxiliary coolant pump can continue to operate while the car has stopped, allowing coolant to circulate and fully dissipate the heat from the supercharger.

This type of water pump is essential for passenger comfort, since it allows for sufficient heating even when passengers are driving in traffic or at low RPM. Also, many modern cars use this second pump to allow you to use the air condition for a period while the engine is off. 

Note that unlike the main water pump, this one is not running all the time. The electronic control unit will regulate the auxiliary pump according to the needs of the moment.

To sum up, some of its unique advantages include:

• Facilitates demand-driven cooling of the vehicle.
• Saves on fuel.
• Enhances passenger comfort.
• Is efficient in cooling down power train components.
• Reduces emissions.

Auxiliary electric water pump diagram

Understanding the auxiliary electric water pump diagram is essential to grasp how this component integrates into the vehicle’s cooling system. This pump is typically located near the heater core or within the engine bay and operates as part of the broader coolant circulation system.

A standard auxiliary electric water pump diagram includes the following key components:

• Main coolant lines – Transport coolant throughout the engine.
• Heater core – Receives heated coolant to provide warmth to the cabin.
• Bypass hose – Allows the auxiliary pump to circulate coolant independently.
• Electronic Control Unit (ECU) – Regulates pump operation based on temperature and vehicle conditions.
• Electrical connections – Power and control the auxiliary water pump motor.

The pump activates based on inputs from the BCM (Body Control Module), ensuring coolant circulation even when the engine is off or idling. This contributes to passenger comfort, fuel efficiency, and optimal thermal management of powertrain components.

For a detailed diagram specific to your vehicle, always refer to the manufacturer’s service manual.

Related content: Peculiarities of an auxiliary water pump

Reasons to change your auxiliary electric water pump

The main reason these pumps fail is the electric motor’s natural age and wear. If this does happen, then the heater core will not be able to heat up and replacement will be necessary.

Within age and wear, there are 5 common ways in which electric auxiliary water pumps can fail:

• Weep hole is leaking coolant, indicating that the dynamic seal has failed. 
• The water pump leaking into the engine, making the oil milky and thin.
• Pump’s impeller fails and makes a chirping noise as it contacts the housing.
• The galleries in the water pump become plugged from sludge build-up.
• Electric motor fails due to a short in the wiring, making it inoperable.

Potential complications

A failed auxiliary water pump will almost never cause the vehicle to overheat. However, if inoperative, you might notice some of the following situations during driving:

• No warm air coming from the heater: since its primary job is to supply hot coolant to the heater core, the first symptom of a problem with this component would be no hot air blowing from the heater.
• Heater shows fluctuating heat: the temperature inside the vehicle is increasing or decreasing based on the driving mode, especially if there is a noticeable temperature decrease when the engine is idling.
• Windows defrost is not working: when windows fog up, the defrost mode is in charge of blowing warm air onto the windshield for clear vision. If the pump is failing, the windows will not defrost rather quickly.
• High-pitched buzzing sound: coming from under your dashboard, this might happen if there is an electrical short in the wiring, making the pump run faster than it should or continue to run after the engine is off.

How to replace an electric auxiliary water pump step by step

Once you have verified the condition of the electric auxiliary water pump and confirm its need for replacement, make sure to follow these steps one by one for an optimal replacement. Remember to always consider individual instructions proposed by the vehicle’s owner manual.  

Auxiliary water pump replacement step-by-step:

1. Drain the coolant from the system.
2. Remove any interfering parts, if necessary.
3. Disconnect the auxiliary water pump connector.
4. Remove all the hoses connected to the pump.
5. Remove all the mounting bolts and the auxiliary water pump.
6. Install the new auxiliary water pump and tighten the bolts.
7. Connect again the hoses back.
8. Install all previously removed parts in the reverse order.
9. Fill up the cooling system with indicated coolant to the required level.
10. Bleed coolant system according to the service manual.
11. Check coolant system for leaks.

And that’s it! You are done! 

Remember to always test drive the vehicle by driving it around and monitoring the cooling temperature!

Discover our range extension of Auxiliary Electric Water Pumps

The importance of proper selection of auxiliary electric water pumps

A good quality electric auxiliary water pump will determine the time span of an optimal coolant system and performance in any modern vehicle. These pumps are not only used to make modern engines efficient but have enabled the cooling of batteries in hybrid and electric vehicles.

With a complete range of auxiliary water pumps of more than 60 references, DOLZ offers its customers the best solutions thanks to personalized attention and the latest technology in the manufacture of water pumps for the aftermarket sector.

If you are looking for top-tier auxiliary electric water pumps, contact us and we will provide you with the information and support you need.

La entrada When and how to install an auxiliary electric water pump se publicó primero en Industrias Dolz.

In addition to their efficient performance, electric water pumps consume approximately 90% less energy compared to mechanically operated counterparts. This surge in demand for electric water pumps has not only contributed to enhanced vehicle efficiency but has also played a vital role in reducing emissions, thereby fostering a safer and more environmentally friendly environment.

A new era for modern vehicle engines

As opposed to electric auxiliary water pumps, which have been market for decades, electric water pumps, acting in the main cooling system, only became available in the automotive market recently. 

The rising popularity of EVs has boosted the demand this type of water pumps, with leading vehicle brands such as BMW, Toyota of Ford incorporating them into their vehicles. 

The versatility of the electric water pumps makes them not only suitable for electric vehicles, but also for modern combustion engines. Their multiple advantages in comparison to traditional water pumps makes them a key choice for the leading players in the market. 

Where does the automotive electric water pump market stand?

As stated by Fortune Business Insights in its 2010 report, the global automotive electric water pump market is growing, and will continue to, at a compound annual growth rate of 14% in the forecasting period of 2018-2026.

The global electric water pumps market can be divided into two different segments:

• Passenger car segment: electric, hybrid and fuel cars.
• Commercial vehicle segment: vans, trucks and tractors.

The passenger vehicle segment has been the strongest in terms of electric water pumps, and it is likely to hold a significant share of the market for at least the next ten years. The rise in demand for private and utility vehicles has come along with the preference for more efficient and durable cars.

Attractive opportunities are posed on the electric water pumps industry as the buying power of consumers is increasing. Consumers are now able to access and easily understand information and features regarding their buying options. The will to spend wisely has positively impacted the preference for cost-effective, environmentally friendly, and low toxic products. Whereas branding and aesthetics were powerful demand drivers in the early 2000’s, the market trend is boosting on quality and practicality.

Although the recent effects of the COVID-19 crisis led the global material supplier industry to suffering serious disruptions, such as supply chain breaks and office shutdowns, the supply side of the electric water pumps market is predicted to recover its normal functioning this year, with an increasing reliance on the automotive aftermarket industry.

Keep reading: Characteristics and Benefits of an automotive electric water pump

Keys on the evolution of the electric water pump market

Innovative modern technologies

New technologies have been adopted globally in vehicles design. This has urged the need for vehicle manufacturers to implement technology in their production processes in order to ensure operating reliability and service life of vehicles. 

Automotive water pumps play an essential role in this sense, as they are reliable over a longer life span, while minimizing wear & tear hazards. New technologies are therefore promoting a positive outlook for the further growth of this market.

Increase in demand for fuel-efficiency

Emission reduction and fuel efficiency are no more a trend, but rather a need. Consciousness regarding the environment, together with government requirements and regulations are expected to drive the electric pump market. 

Electric water pumps power system dramatically decreases load and stress levels in the engine, thus highly increasing results and durability. Furthermore, matching its output to actual cooling requirements of the combustion engine can reduce exhaust emissions and fuel consumption significantly.

Forecast of market trends in the upcoming years

Industry experts expect that the market will continue growing in the long-term. According to recent reports, such as the Global Electric Water Pumps Market report by Market Watch, the market is expected to stabilize at a 10.3% CAGR in the forecasted period 2021-2027.

Major companies in the global automotive electric water pumps market are increasingly focusing on research and development activities to create new and innovative products that secure them staying ahead of the competition.

Only this way will companies be able to make a difference and fight against real-life concerns such as ambient air pollution.  Fuel efficiency must therefore live at the heart of vehicle manufacturing, and the only way through is by using electric water pumps.

Know more about Dolz’s electric water pumps

DOLZ is in charge of producing and distributing automotive water pumps for passenger and commercial vehicles in the aftermarket. With more than 5,5 million pumps being produced per year, we are proud to count with more than 1.300 references.

Our electric water pumps highly reduce emissions from modern engine. Their supply flow is independent from the number of engine revolutions, allowing cooling as required and reducing fuel consumption and pollution.

Dolz’s electric water pumps meet the highest possible standards, as they are OE equivalent. At our fully automated plants we work to ensure premium quality, extreme durability and a completely personalized service. 

Contact us if you would like to have further information about our products:

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