Cred c-am gasit si cauza. Complaint: 1. E46 with M47/TU: Humming or droning noises in the engine speed range 2500 - 3200 rpm with a peak at 2900 rpm when driving steadily or under load. 2. E46 with M52, M54, M56: Humming or droning noises in the engine speed range 2000 - 4000 rpm. In addition - or at very low engine speeds - howling noises (similar to timing chain) may also occur. 3. E46 with M57: Humming or droning noises in the engine speed range 2000 - 3500 rpm when driving steadily or under load. 4. E46 with N40, N42: Humming or droning noises at all engine speeds. Cause: The vibrations of the engine are transmitted into the vehicle interior through the intake pipe of the air-conditioning compressor. (fmm ! :pirate:) Affected vehicles: E46 with air-conditioning system (option 530) or automatic air-conditioning system (option 534) and the following engine versions: 1. E46 with M47/TU (only 320d) Manufacturing period: September 2001 until 9 April 2002 2. E46 with M52, M54 Manufacturing period: start of series production until January 2001 3. E46 with M54, M56 Manufacturing period: January 2001 until 25 September 2002 4. E46 with M57 Manufacturing period: September 2001 until 14 April 2002 5. E46 with N40, N42 Manufacturing period: from March 2001 Procedure: In case of customer complaint, replace the "intake pipe from evaporator to air-conditioner compressor". New intake pipes are fitted with a vibration damper weight. On vehicles with M54, M56, N40 and N42 engines, a "muffler", a small expansion tank, is fitted on the compressor side of the intake pipe. SI Humming, droning noises when air-conditioning system is switched on E46 M47_TU,.pdf