speaking from experience,renew all the seals / O rings...i didn't and had to do the job twice. 2x o rings for crack pipe 1x seal thermo housing to block 1x o ring thermo fr housing 1x o ring thermo housing 3x o ring sender switches (yello,blue,brown) a bottle of G12 coolent I've posted the part no.s for the above on this section yesterday look in "water leak" good luck.