hello im new

I found this plug hiding under a plastic cover on my st170 is it supposed to be connected to something? it looks like it has been tie wrapped out of the way, the car runs fine with no problems, any ideas?

 

Don't know what it is or what its for but on my old one it was loose as yours is and all was fine, think its some redundant sensor wiring used on another model.

 

Looks like a water temperature sensor.
Radiator fan run on switch if the cables are Red and Green with Yellow.

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temperature sensor AFAIK

 

air temp sensor

 

thanks guys, do you think it's supposed to be connected?

 

thats standard mate. its an outside air temp sensor. thats exactly where it belongs!!!!

 

Its not the outside air temp sensor as thats behind the bumper, it's the under bonnet air temp sensor. If it gets a bit toasty under there then the fans will cut in to help prevent heat soak!