how does it cost to replace the horn on 1999 Buick LeSabre

last summer it was so hot that the horn started going off by itself,it finaly got stuck so we disconected it

Asked by for the 1999 Buick LeSabre
First you need to know the cause of horn staying on. Problem usally in steering column and if it has an air bag it can be in that unit. The air bag is the worst case since there is no repair for it ....just have to replace it.