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Originally Posted by Mk2mat
No probs mate. If your heater matrix were leaking, your carpets would be wet and you would more than likely smell it. The reason it leaks more when running is that it becomes pressurised. It sounds like you've found your leak already 
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audi's thrive on new coolant every 3 yrs.
both 5's & 6's should always be power flushed,
make sure the system is completely bled!
Air in the coolant is rarely diagnosed as the
source of heating woes, it need not be.