I have a 2006 Chevy Cobolt, 128k miles on it 2.2 L engine, and have been leaking coolant, smells very strong, leaks ~ a hald a gallon a week or so. I can not find the source of the leak, but it is not in the oil. My windows are also getting foged up really quickly and my defroster can barly keep up. I replaced my radiator about 6 months ago so I know that is good and the engine is runing hottter then normal particularly when idle (200-220 F range) I haven't gotten any over heating warnings but there is deff a leak coming somewhere I think it could possibly have something to do with the heating coil as the antifreeze seems to be coming in through my air vents. Any ideas on what the issue might be?