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
READ NEXT:
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:
The following illustration is a schematic representation of all the body
variants.
Apply this illustration to the relevant vehicle.
Fig. 76: Identifying Vehicle Components
All components not listed in the table below are composed of established
sheet steel qualities.
MATERIAL CHART
VEHICLE IDE
Observe SAFETY INSTRUCTIONS FOR HANDLING VEHICLE BATTERY.
Before disconnecting battery
Turn off the ignition and other electrical loads/consumers to prevent
sparking when reconnecting.
NOTE: If the ignition is not turned off when the battery is disconnected,
fault memories
may be set in some contr