64 53... Notes on replacing dryer flask or desiccant insert

Note for all E8x and all E9x vehicles: 

Replacement of desiccant insert is only possible until 12/08.

Beginning in 12/08, the air conditioning capacitor must be replaced.

The dryer flask or desiccant insert does not have to be replaced at regular inspection intervals in a functioning, leak proof A/C system.

However, the dryer flask or desiccant insert must absolutely be replaced in the event of: 

• contamination of the refrigerant with debris (e.g. when the compressor is clamped).
• a leaking A/C system or loss of refrigerant
• the refrigerant circuit being open for a period exceeding 24 hours, e.g. during a repair.