Early this Spring, Heater Core seemed to be leaking... antifreeze steam coming out of windshield defrost vents. Passenger side never flooded or anything. Got warm outside, didn't need heat at all, so when I turned dial to cool, I guess it shut off the core enough to stop leaks for summer season. Now its getting cooler and its steaming again, although I still have dial on cold. Im puzzled because the steam comes mostly out on the driver side, I thought the core was directly behind passenger side dash. Is it possible it is a hose rather than the actual core? I guess I am screwed either way as I have to remove dash to check it.
Still hasnt flooded passenger side but antifreeze steam sucks to breathe. Question is, do I have any other recourse other than replacing the core? Could it be ANYTHING else?....