I have a 2002 Taurus and the car was blowing cold air when I had it turned to hot to warm up the car. I checked the fluid and the resavoir was empty. I put a whole pre-mixed jug of antifreeze in and it just started to show in the resavoir. The strang thing is the car was not over heating according the the gauge inside the car. I don't see the fluid leaking anywhere so what could the problem be? Please help, thanks.