It's most likely the A/C evaporator or heater core leaking. You won't notice the drop in coolant level. Most shops that work with this type of thing will recognize the smell right away. You might try checking the A/C drains under the car for clues.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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