Your Bmw water pump allows the coolant to flow through the engine of your car. Without a water pump your engine will get overheated and break down.
Although we recommend you replace the water pump at the same time as your timing belt, it is possible it breaks down by itself. If the engine temperature gauge goes up and down when driving, it is likely there is an issue with your water pump. When at standstill steam may come off the bonnet. A leak can show itself by white traces of a powdery substance onto the engine. When discovering these, replace the water pump immediately as coolant can easily damage the timing belt.
To determine which water pump you need for your Bmw, please select the model and engine into the selector.