Firstly you havent given much info as in 318i ??? build year ??? and are you sure its the coolant temprature sensor :
#15 here RealOEM.com * BMW E36 320i Cylinder Head Vanos
this is for a 320i so you can do your own search on the above if you have a different model/year etc.If you cant find it or thats not the sensor then get back to me
Remember the more info the better chance of help!
__________________ VELVET BLUE UK INDIVIDUAL , IM THE LAST
UNITED WE STAND DIVIDED WE FALL
I stepped in a plate of Pasta the other day - now I have to worry about my Carbonara footprint!