Instructions for desiccant insert replacement (4' Series Coupe/Convertible, 4' Series Gran Coupe Sedan)

Required special tools: 

• 32 1 270 

A desiccant insert need not be changed at regular inspection intervals in a well-functioning, sealed air conditioning system.

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

• Contamination of the refrigerant with shavings (e.g. when the compressor is clamped).
• With depressurized and/or completely drained refrigerant circuit.
• In case of a refrigerant circuit, which was closed using special tool 32 1 270  but remains open for more than 24 hours.

The desiccant insert cannot be replaced in the following vehicles: 

• 1-Series E8x, 3-Series E9x from 12/2008 
• E84, E89 
• F series 
• G series 
• BMW i without heat pump 

In these vehicles, the condenser for the heating and air conditioning system must be replaced.

• BMW i 01 with heat pump 

On this vehicle the low pressure battery must be replaced.