This 5 series BMW came in with a leaking water pump. Luckily the owner was attentive and brought it in before more serious problems developed (see previous post). These pumps usually start leaking from the drive shaft but can also leak at the seal to the block. These sometimes develop a loose impeler as well. This won’t cause a leak at the pump but will cause the car to overheat.
This is a fairly straightforward job. The radiator, fan and belts are removed. The old pump is removed and inspected, the block is cleaned up and a new pump is installed. The cooling system is always inspected thoroughly, any questionable hoses or belts should be replaced, new BMW coolant is added and the car is back on the road.