There are bleeding screws on the hoses that go from engine to the heater, they are on the left side as you sit in the car. I don't have a picture at the moment but should not be hard to find.
I would be more worried about why there was low coolant in the first place.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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