I'll look tomorrow morning. Mine actually had to be replaced when the car was a few weeks old, they wavered in pitch when activated. If I recall, they may be in the section between the engine compartment itself and the radiator, I think there is a separator there where the fan is mounted.

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2011 535i AT | Black Sapphire/Cinnamon | Premium | Heated Sts | Nav | Sirius | Anthracite Hdr & Trim
Prior: 2008 335i 6MT Sedan | Black Sapphire/Terra Leather | Premium | Cold | CA | OEM Alarm
Prior: 2005 330i 6MT | Black Sapphire/Sand Leather | Premium | Cold | UGO | OEM Alarm