BMW 7 Series: Instructions For Desiccant Insert Replacement
A desiccant insert that is in a correctly functioning, sealed A/C system does
not have to be changed at regular
service-inspection intervals.
The desiccant bottle or desiccant insert must be replaced in the event of
- the refrigerant being fouled by chips (e.g. mechanical damage to the
compressor due to clamping)
- 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)
INSTRUCTIONS FOR OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT
WARNING:
- Avoid contact with refrigerant and refrigerant fluid.
- Follow safety instructions for handling R 134A refrigerant.
- Follow safety information for HANDLING REFRIGERANT FLUID.
IMPORTANT:
I. Part replacement as preliminary work fur further repair work and part
replacement based on gradual leakage
(minor leak, e.g. hairline crack)
Procedure:
- DRAW OFF A/C system, then determine drawn-off refrigerant oil quantity
- Carry out part replacement
- Replace removed refrigerant fluid and additionally top up with new
refrigerant fluid according to
components replaced:
- Compressor: refer to NOTES ON REPLACING COMPRESSOR
- Evaporator: 10 ml
- Capacitor: 20 ml
- Desiccant insert/dryer flask: 20 ml
- Each replaced refrigerant line: 10 ml
- Capacitor with integrated dryer: 40 ml
- Safety pressure switch and seals: no additional refrigerant fluid
- EVACUATE AND FILL A/C system
II. Part replacement due to sudden leak
(major leak, e.g. pipe break due to accident)
Procedure:
- DRAW OFF A/C system, then determine drawn-off refrigerant oil quantity
- Carry out part replacement
- Replace removed refrigerant fluid and additionally top up with new
refrigerant fluid according to
components replaced:
- Compressor: refer to NOTES ON REPLACING COMPRESSOR
- Evaporator: 35 ml
- Capacitor: 35 ml
- Desiccant insert/dryer flask: 55 ml
- Each replaced refrigerant line: 35 ml
- Capacitor with integrated dryer: 55 ml
- Safety pressure switch and seals: no additional refrigerant fluid
- EVACUATE AND FILL A/C system
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Notes
WARNING: Risk of injury! Refrigerant circuit is under high
pressure! Follow safety instructions for handling R 134A refrigerant.
Avoid contact with refrigerant and refrigerant oil.
Follow saf
Notes
WARNING: Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134A refrigerant.
Avoid contact with refrigerant and refrigerant oil.
Follow safety
Notes
WARNING: Danger of injury!
Refrigerant circuit is under high pressure!
Follow safety information for handling R134a tetrafluorethane refrigerant.
Follow SAFETY INFORMATION for handling refrigera
SEE MORE:
WARNING: Version with xenon headlights:
Danger to life due to high voltage!
Therefore disconnect all components from voltage supply before removal.
Work on the entire xenon lighting system (control unit, ignition unit with
lamp) may only be carried out by specialist personnel.
Necessary preliminary
NOTE: Carry out preliminary work as described in REPLACING DRIVE BELT.
Slacken screws (1)
Relieve tension on DRIVE BELT and remove from belt pulley (2).
Unscrew bolts (1) and remove belt pulley (2).
Installation note:
Lettering on belt pulley (2) must point forwards.
Replace microencapsulated scr