My 2000 Honda Civic is losing antifreeze from the radiator. There is no change in the overflow reservoir level. No sign of antifreeze in the oil or transmission fluid and no sign of any foreign fluids in the overflow reservoir. I have not been able to find any fluid inside the car (heater core leak) and can't find any puddles under the car...the stuff is just disappearing without a trace, like it's being consumed in the combustion and going out the exhaust. It's doing it fast too. A 15 mile trip can make 1 cup of antifreeze mix disappear out of the radiator only. Does anyone have any ideas where it's going and how do I confirm and stop it?

 

You have a leaky/blow headgasket.

 

First thing I'd check is your cooling fan fuse in the engine fuse box. I had the same problem and that fixed it. Without the cooling fan on a hot day, the radiator burns antifreeze like a fat kid eats candy.

 

yea check ur spark plugs first and if they are rusted or water in them u got a leaking head gasket

 

which one is that fuse? my fuse box cover is missing so i dont know which one it is

 

Its a 15 amp fuse in the upper right corner in the engine fuse box.