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Latest News Electric Water Pumps (EWP) What a technician needs to know about electric coolant pumps and water circulation pump functions and diagnosis. A fact about belt driven coolant pumps:
Question asked: why is the trend towards replacing the traditional belt driven mechanical coolant pump on current vehicles with electric types? Typical BMW Electric Coolant Pump
Note: An auxiliary water pump connected to the cooling system on vehicles fitted with belt driven mechanical pumps can be utilised for the circulation of coolant through various systems for temperature control purposes. This application does not reduce engine power losses but will improve systems temperature control. These pumps have been utilised in Diesel vehicles for a while but now are commonly fitted on many petrol and hybrid vehicles with more and more manufacturers turning to multiple electric water pumps for greater temperature control. Typical systems may be:
Typical auxiliary water pump Auxiliary pump modes of operation. The auxiliary pump (like the electric coolant pump) does not continuously operate. The PCM or controlling module requires specific input data for pump control. Typically:
Note: Mercedes stationary ventilation system - Remote activation of the heating and ventilation systems makes pre-entry climate control of a parked vehicle possible. The heating or ventilation are activated depending on the exterior temperature and the target value set on the A/C control panel. If the vehicle is equipped with Mercedes Stationary ventilation system, which operates after the driver has left the vehicle, there are additional parameters required to activate the pump. These include:
Testing the pump function. A suitable scan tool can test the pump function in most vehicles. It may also be possible on some vehicles to test the system by pressing a HVAC vehicle specific control head button sequence as required by manufacturer. Typical Causes of pump failure. Electric motor brushes wearing is a common cause as is with most electric motors. Overheating can cause premature failure due to coolant being forced passed the shaft seals. Low coolant levels may also prematurely damage the electric coolant pumps. Incorrect coolant inhibitor mixtures may also cause internal damage to pump and engine coolant chamber surfaces. Connector terminals condition at harness and/or pump. Diagnosis An auxiliary water pump generally will not cause engine overheating but will cause specific system temperature inconsistencies. The Premier Auto Trade Sensor range includes 7 Electric Water Pumps (EWP), covering over 130,000 vehicle applications in Australia and NZ. When you supply and fit products from Premier Auto Trade you can expect a product designed and tested to the vehicle manufacturer’s specifications offering OE form, fit and function. Premier Auto Trade distributes products throughout Australia via a network of specialised resellers and leading automotive groups.
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