I just went through this with an M104 engine. The auxiliary fan relay was bad (cheap repair), that was changed as well as the thermostat. I was looking at temps of close to 115C to 120C in easy city driving before the fix. Now temps are around 80 C to 90 C regardless of where and how I'm driving. Good luck ... Get it fixed soon so you don't burn up a headgasket.
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