Instructions for desiccant insert replacement (M4 2021-2023)
WARNING: This page is about a different car, the 2025 BMW M4, 2024 BMW M4, 2023 BMW M4, 2022 BMW M4, and 2021 BMW M4. However, it is still accessible from the selected car via links, so may be relevant.
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.