location of coolant temp sensor in a 2003 A6 1.9 tdi

Hi,
Im looking to find the location of the coolant temp sensor in a 2003 A6 1.9 tdi. I thought it was at the back of the engine as some posts seem to suggest, then some say its at the front bottom right by the radiator.
Engine code is AWX 407806.
Any help/images would be great.
Thanks

A6 1.9 TDi coolant temperature sensor

Thanks Doctle Odd,
I have looked at that sensor, the first one I bought was 4 pin blue.....duff advice, so realised it would not fit, hence the question to clarify the location. I now know I need the 4 pin green..typical