The sensor that tells your gage how hot it is. Typicly it is threded right into the rad its self. I dont know where it is located, I was just thinking out loud, to try and help think through your problem. The Bently manual is a tell all book. Hopfully someone will chime in soon with some info. I'll google it and see what I come up with.

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Pro motocrosser since 2005. First time BMW owner.
2002 4.4 E53