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I had similar issues in my Cosworth. The heater core was leaking just enough to run down underneath the carpet without making the top layer of carpet wet. Carpet was just a little moist. With the carpet pad soaking wet everytime I turned on the heater all the windows fogged up. There was only a very faint smell of antifreeze in the cab. Similar issue in my SAAB but the core was leaking alot and the smell was strong with a soaking wet carpet.
Can you smell any antifreeze at all and check under the dash for any moisture. Might have to remove some panels or pull up some carpeting to be sure the padding isn't wet. You must have some water inside the cab or a leaking heater core.
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