2001 Chevy Impala Electrical Clicking noise! HELP!

I seem to have an electrical problem. When I start the car, put it in reverse, or shut the car off and lock the doors, I hear this clicking noise comming from underneath the dash. When I lock the doors I hear it underneath the hood inside the battery. I believe that I have bad relays. But I've taken it a few places and people just tell me I have a bad relay. When we put a new one in, we still heard the clicking. So now I'm really confused! If anyone has this problem or has had this problem and his fixed it, please help me out here. The clicking is driving me crazy. Oh, and on top of that, my low coolant light is on and it won't turn off. And I've already filled the coolant. I don't have a leak, so I can't figure out why the light won't go off. Any comments on that, please let me know! Thanks!