The electric water pump circuit uses both a temperature sensor and a relay to control it’s function. The temperature sensor tells the water pump there is a demand for it to circulate coolant based on engine temperature. The relay acts as the on/off switch to send power to the pump. Either of these can be at fault. The sensor may not be registering temperature correctly so it is constantly calling for the pump to run. The relay can be stuck in the On position as well, never turning power to the pump off. The pump itself can also have an internal short that is causing it to never turn off. Judging by the age and mileage of the vehicle, you may still be under warranty. The BMW factory warranty is 4 years or 50,000 miles, whichever comes first. That applies to any owner and starts from the original sale date of the vehicle. If the vehicle is not longer under warranty, have one of our mobile techs come to you. They can inspect the electric water pump circuit and find the exact cause.
How to Identify and Fix Common car Problems ?
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Wear and Tear
The most common cause of water pump failure in BMW cars is simply from age and heavy use of the vehicle. Over time, most parts in a car start to break down through constant wear and tear. Since the water pump is made of plastic, it will slowly degrade over the lifetime of your vehicle.
A failed water pump will not only cause your car to overheat, but it can also cause additional engine damage such as cracked cylinder heads and head gaskets, for example. The longer you drive without the engine being cooled down, the more significant damage is done.
About Water Pump Replacement
A failing water pump can also leak causing further loss of coolant. Water pumps are designed to last at least 100,000 miles, however, if your water pump fails, you should replace it with a high-quality original-equipment level unit.
A pump failure is a mechanical or electrical problem that prevents a pump from functioning correctly. This can be caused by various issues, including a broken impeller, a loss of power, or a clogged filter.
You should replace the water pump after 60,000 to 100,000 miles for most modern vehicles.
Power Source If your pump has stopped working, or is not operating to the levels you expect, it could be a power issue. Look at the factory specifications for your pump and ensure that it is receiving the correct electrical power supply in order to work properly.
Unusual Noises: In addition to coolant leaks and engine overheating, another common symptom of water pump failure is strange noises coming from your vehicle`s engine. More specifically, a high-pitched sound coming from the pump may indicate that a water pump pulley has loosened or a bearing has started to wear down.
Common problems include overheating, leakage, low water pressure, noisy operation, and cavitation. These problems can be prevented or fixed by regular maintenance, inspection, and replacement of worn-out parts.
Pump impellers and seals may fail and foreign matter and debris from the tank can clog the pump internals. Low water levels in the tank can also cause run dry failure. If your pump/motor system stops running you may have an electrical fault or foreign matter seizure.
Most experts recommend that you should change your water pump when the timing belt is serviced. Water pumps are driven by the timing belt and usually last around 100,000-150,000 kilometres.
Generally, sump pumps can run for six to 24 hours continuously, depending on how heavy the rainfall is and the quality of your pump.
When a water pump completely fails, it is no longer able to move coolant through the engine; this causes it to overheat. If you see steam, pull over immediately and call your mechanic for assistance — continuing to drive with an overheated engine can damage it to the point that it will need to be completely replaced.
When water pumps go bad, it causes your engine to overheat—and that leads to all sorts of trouble. While water pumps are designed to last a vehicle`s lifetime, it`s entirely possible for them to fail before that mark.
One of the common signs of bad water pump functionality is overheating. The pump may not leak coolant, but the pump mechanism itself may have failed. Over time the fins of the pump can actually wear down to the point where they are no longer moving coolant.
Too Little Air in the Reservoir Tank
These tanks depend on air pressure within to regulate the pressure switch. If the inside air pressure drops, the tank will not trigger the pressure switch correctly, causing the pump to switch ON and OFF erroneously.
The average Water Pump uses 150 watts. Your devices wattage may be different depending on the brand, size, or other factors. You can generally find the wattage of your Water Pump in the user manual or on the device itself.
Try removing the tubing and blowing air through it. Check pressure switch tubing for leaks or clogging. Clean or replace the tubing. The clog could also be debris in the orifice on the bottom of the pressure switch sensor, or inside the sensor requiring that the switch be replaced.
So a minute on and a minute off has always been the minimum rule of thumb. Two minutes on and two minutes off is just that much better for the motor. With the old conventional pressure tank method, the pressure tank fills at the rate the pump can produce, less the amount of water being used at the time.
Electric water pumps can circulate coolant even after the engine is turned off, providing additional cooling to critical engine components and minimizing the risk of heat-related damage.
The best way of fixing a faulty water pump is to replace it with a new one. Depending on the extent of damage to the cooling system, replacing the thermostat, radiator cap, and gasket together with the water pump is usually recommended.
It is possible to drive your vehicle without a water pump, but not good to. Some people in the racing circuit or who drive racing vehicles purposefully remove their water pumps to obtain more horsepower to their engine. If you are driving a vehicle for everyday use though, a water pump is a must.
A squealing or chirping noise from the front of the engine can also be an indication of a failing water pump. It can sound very much like when a serpentine belt is making noise, and in many cases, that`s because it is.
The water pump is one of the vehicle components that may never require replacement if your vehicle is well-taken care of. You can own a car for over 15 years and never have to replace the water pump. That`s not to say that it can`t develop a problem.
An electric water pump is far more in tune with your engine`s specific cooling needs. By utilizing a controller, it can determine how much coolant circulates through the engine at given temperature ranges and maintain a target temperature. This prevents inadequate or excessive cooling.