Coolant Temperature sensor defective?

[Frederik159]

Hi All
first sorry for the bad english. I dont know a lot about the english therms for engine-parts.
My Volvo 740 Diesel is causing me some problems.
it is leaking diesel from 3 of the nuzzels or what they are called and from the pump. it smokes and sow one....

but I will start by try to fixing the Coolant Temperatur sensor.
I think its a lose connection, because it stopped working when i was fixing something else, and because the wiring is terrible. Sow my question is simple. where is the sensor sow i can check the connection?
http://www.image-upload.net/viewer.p...5wrehs5dx1.jpg
Where is the sensor?
please lead my way??