d.man

Good morning all I have a 1998 galaxy 2.0. has been a good old bus, but is starting show signs of wear and tear! i need some help with the coolant system. Between the engine block and the top of the radiator, there is a housing for a sensor. This housing has perished and needs replacing. Problem is i have no idea what it is called, which makes asking for one a bit tricky! I have tried searching online using the part number (023 121 174) but this comes up with no results. can anyone steer me in the right direction? thanks all danny