You lost the water pump. Look at all the spooge on the fan blades. It's heavier in the center, not the outside edges. If the outside edges were coated, I'd suspect the expansion tank. Inside, water pump.

From the look of the coolant, you don't have the proper coolant in the system (it should be blue).

Recommend you replace the thermostat, wp, and both belts. If your hoses haven't been replaced and are original, now is a good time to change the hoses as well.

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual