Is your BMW E39 Check Engine LIght on? It could be the water pump.

 

If the car seems to be overheating, water pumps and thermostats are common failure points.   Occasionally you will see issues with the radiator. The electronically controlled thermostats are prone to failure and set the “Service Engine Soon” warning light.  They can short out internally and melt a section of the engine wiring harness on some V8 Models.

 

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