A few days ago I saw that my car was leaking antifreeze really bad ( it's had a small antifreeze leak for a while from a hose with a loose clamp which is where it was leaking from this time.) After I got off work the day it was leaking bad my car ran hot and was knocking near the radiator. My heat was blowing out cold air also. I have no idea what do do. I was going to buy a thermostat a hose clamp and waterpump but don't want to waste the money and that not be it. Please help.