i have a 2000 trailhead edition. i have a coolant leak in the brass housing that the temp sending unit screws into coming off the front of the t-stat housing. it is a medium size brass piecce that screws in to the block or head i guess??? on the bottom a hose connects to it and on the top the temp sending unit screws into it. on the very front a flat surface has a small hole. how difficult to replace and does anybody have pointer on this???