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what were your other electrical loads at the time? do you have a scan gauge or some other way to see what your battery voltage is? I'm guessing that your alternator is either turned off or putting out just an amp or two and when you turn the heater fan on it's energizing the whole alternator, I haven't checked to see what kind of alternator controls your car has but I would guess that is what is happening.
Another way to test is to leave the fan on but to turn the heat down as that should turn the valve to the heater core off.
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