A/C - Hissing Noise From The Dash Area
SI B 64 09 05Heating and Air Conditioning
November 2005
Technical Service
This Service Information bulletin supersedes S.I. B64 09 05 dated August 2005.
[NEW] designates changes to this revision
SUBJECT
Hissing Noise from Air Conditioning
MODEL
E90, E91 (3 Series) vehicles produced up to September 1, 2005
SITUATION
The customer may state that when the air conditioning is on, a hissing sound is heard from the dashboard area.
CAUSE
Refrigerant gas is entering the expansion valve causing the hissing noise
PROCEDURE
Increase the amount of refrigerant charge in the system from 500g (specification) to 590g.
1. Evacuate the existing refrigerant (500g) from the system.
2. Note: If the system was low on refrigerant (below 500g), the system should be checked for leaks.
3. Recharge the system with the new specified amount (590g).
4. Install a new label over the old label with the updated refrigerant capacity.
[NEW] PARTS INFORMATION
WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty.