I just my one of those replaced not that long ago. I just had a small weep from it.
$30 part, 3hrs work to fit it! plus coolant.
They are of plastic and are not serviceable, yes they are in two parts sort of plastic welded together!
Part #4 it is.
https://www.aulro.com/afvb/images/im...11/10/1304.jpg
https://www.aulro.com/afvb/images/im...11/10/1305.jpg

