I have this car I just bought at an auction. I drove it home and when I got off the highway it started to over heat and i could smell antifreeze when I parked and got coolant it was leaking and when I put some in it would smoke (cold outside engine hot). The heater did not work and when I started it to drive it the rest of the way home it had a little buzzing sound but was not really overheating went to the line between the half way point and the "h" what could it be need to try to fix asap?