A/C - Droning Noises With The A/C ON
SI B 64 06 09Heating and Air Conditioning
August 2009
Technical Service
SUBJECT
Droning From the Engine Compartment When Using Air Conditioner
MODEL
E82, E88 (1 Series)
E90, E91, E92, E93 (3 Series)
SITUATION
When the air conditioning system is in operation, a droning noise from the engine compartment may be heard. In addition, vibrations may be felt through the steering wheel at engine speeds of between 900 and 1,100 rpm.
The noise is no longer present when the air conditioner system is switched off. Additionally, there may be a complaint of diminished cooling output.
CAUSE
Insufficient refrigerant in the cooling circuit
CORRECTION
Do not replace parts.
Check the fill level of the air conditioning system (note that vehicles up to September 1, 2005 had 500 grams of refrigerant). If necessary perform additional leak diagnosis and repair.
Refill the system with 590 +/- 10 grams of R134a, regardless of the production date of the vehicle. Refer to Repair Instruction REP 64 50 009 (Drawing off evacuating and filling A/C system [R134a]).
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.
Sublet Code 4** $1.00
** Reimbursement of up to the amount listed may be charged to sublet code 4 for adding R134a refrigerant.
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