The horns on a 2000 are behind the plastic wheel well lining above the fog lights or where they would be if you had factory fog lights. They should look kinda like a black snail shell. If you found the vacuum canister then you should be able to see the horns just look a little farther behind that area and you should see a triangular bracket that is a brace and attached to that brace should be the bracket for the horn. If you had your Jeep in water very recently then you probably just have water in them and they need to dry out and they should be fine. Mine did this back in high school but they dried out after a few days.