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Old 02-25-2012, 11:12 PM
CTBimmerGuy CTBimmerGuy is offline
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Location: Middletown, CT
 
Join Date: Oct 2007
Posts: 104
Mein Auto: 1999 M3 Convertible
Check the neck of your radiator where the top hose connects. The neck of the radiator frequently cracks. I wonder if the fluid could be evaporating through a crack at the neck of the radiator or escaping through the crack and evaporating so you don't see any evidence of it. A long shot I'm sure but may be worth checking.
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