This ia what the Rabbi Answered about marrying a man with a Vasectomy.
The vasectomy procedure is done on the vas deferens (many, if not most times) inside the body cavity (as opposed to the sexual organ extremities). The person is therefore not considered a “Petzuah Dakah” of the Torah, and may marrry or remain with his wife if they had a proper orthodox marriage – (source: “Chazon Ish” E.H. 12:7). If the vasectomy was done on the outer organs, then if reconstruction surgery repairs the vasectomy damage, he may marry or remain with his wife (if he was married). If the reconstruction surgery is not successful, but the majority of the people who have the reconstruction surgery are able to procreate, then even the person who did not have successful reconstruction surgery is still allowed to marry, or remain with his wife (if they had a proper orthodox marriage) – (source: “Igrot Moshe” by R’ M.Feinstein, E.H. IV 30).
And Yes He retains his Cohen Status and can still bless and all the Kohen laws are to be followed