This happened to me but it was the transfer coolant pipe which caused the issue. Of course I have had water pipe seal replacements. There is a kit you can get to fix the issue if it is that but there is a bit of work involved as you have to take off the inlet manafold. I had mine done by my trusty mechanic as I dont have all the tools.

The M62TU transfer coolant pipe in a BMW is located in the engine valley, specifically between the cylinder heads. It's a metal pipe that transfers coolant between the front and back of the engine. It's also known as the "water jacket" or "coolant transfer pipe"

Just thought I would let you know.

cheers

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2005 X5 4.4i M Sport
2003 X5 4.4i