If you're getting a loud fan when the car is hot (hot day sitting in traffic) then it's normal. If it's loud right when you cold start the car, then there's a problem. Either way, get the car scanned at a place that has something to scan BMW specific codes.
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--Marcelo
'06 Arctic Metallic 325i | Sport Package | 6MT | Dinan Stage III suspension | Dinan exhaust | 330i manifold swap! Click here! | Active Autowerke tune | 135i Brake Calipers | Deiselboost caliper brackets | E46 M3 front rotors
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