Well thanks for all the replies
I can tell you that it is not for the auto choke, I still have a manual one.
It's not for an electric fan, don't have one of those either
The motor is as it came out of the factory so it must be an emissions/temp sensor like has been suggested.
The car was running at about half the temp it normally sits on so one could think only one wire is broken so maybe it reads low but on the way to work today it was back up to normal temp so it may have just been the cool night air that was affecting it but I have never noticed before.
I always tend to watch the gauges very closely after I have had work done on the car!!