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Still confused. If I look that up that part # on RealOEM.com it shows it's for an X5 or X6. No X3 application.
I agree with Pungo - you need to scan the codes with something that reads BMW codes, not just a generic OBDII scanner. Even if the car has a tranny thermostat, and even if it was stuck wide open, it seems odd it would give you an overall engine coolant error.
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