'01 X5: loud whistling sound in front of engine

'01 X5, 3.0L auto. On startup there is a loud, high pitched whining/whistling sound coming from the front of the engine. After warm up the sound generally disappears. Fan belts are new, ~4 months old.
Could it be the water pump? clutch fan? power steering pump? All fluids are topped off.
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It's probably the air pump that only runs when the engine is cold.
FloydR
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