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My thermostat failed on my 2011 N55 135i when the car was around 2 or 3 months old with maybe a couple thousand miles on it. The dealer had the car for several weeks while they replaced, under the direction of factory support people, the water pump, the radiator with sensors, and finally the thermostat. The thermostat replacement fixed the problem. Fortunately, they provided a nice 335 coupe as a loaner while the car was being repaired.
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