3 Series E46 325i (M56) TOUR
VS-23/Pollatschek
Baugruppe/Group: 64
64 03 03 (958)
weltweit
Datum/Date:
03/2003
Update: 05/2003
Humming, droning noises when air-conditioning system is switched on
E46 M47/TU, M52, M54, M56, M57, N40, N42
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.
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.
1.
Drain air-conditioning system.
Please refer to Repair Instructions 64 50 009
2.
Replace the intake pipe from the evaporator to the air-conditioner compressor.
3.
Evacuate the air-conditioning system and refill.
Please refer to Repair Instructions 64 50 009.
Comply with instructions for replacing drier bottle 64 53
Important!
In such cases, exchanging the air-conditioner compressor or expansion valve will
not remedy the situation.
SI Humming, droning noises when air-conditioning system is switched on E46 M47/TU,
BMW AG - TIS
14.02.2013 02:36
Issue status (12/2007) Valid only until next DVD is issued
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