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Hi Peter,
If the heater core were leaking or seeping, you would not see a warning light, until the coolant level in the expansion tank dropped low enough. While I'm not saying that it is definitely your core, I would mention that foggy windows (all windows) is a strong sign that the core may be at fault, as the blower would be acting as a humidifier, due to a leak, and the moisture would be distributed throughout the car. Also if the ECC has a mechanical issue, it might not be allowing fresh air into the cab (stuck in re-circulate mode).
My .02
BB
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