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If I were you, I would ask them why they think it is that part. That's what is confusing about this whole thread. You give a trouble code for engine coolant and say that somebody thinks your tranny cooler thermostat is bad. There has to be more to it because that does not really compute. If I had a coolant temp code for the engine like that I would suspect the main coolant thermostat. It would not occur to me that it was the tranny cooler. If it were me I would just scan the codes myself. If you download BimmerLink to your phone and get a BT dongle you can read them yourself. See if you get any tranny codes. But you can live monitor your tranny fluid temps.
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