64 52... Instructions for opening and replacing parts in refrigerant circuit
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WARNING:
- Avoid contact with refrigerant and refrigerant oil
- Follow safety instructions for handling R134a refrigerant , see 64 50... Safety instructions for handling refrigerant R134a
- Follow safety instructions for handling refrigerant oil , see 64 50... Safety instructions for handling refrigerant oil
CAUTION:
- Always use new O-rings each time A/C connections are opened (refer to Electronic Parts Catalogue)
- Moisten O-rings with refrigerant oil prior to fitting
- Seal all parts to be returned at openings to prevent ingress of moisture or foreign bodies
- Opening refrigerant circuit
without part replacement, as preliminary work to further work
(e.g. engine removal):
Work sequence:
- Draw off A/C system, then determine drawn-off refrigerant oil quantity, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Carry out main work
- Replace removed refrigerant oil with new refrigerant oil
- Evacuate and fill A/C system , see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Part replacement and part replacement on account of insidious leak
(minor leak, e.g. hairline crack)
Work sequence:
- Draw off A/C system, then determine drawn-off refrigerant oil quantity, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Carry out part replacement
- Replace removed refrigerant oil with new refrigerant oil
- Additionally
replenish new refrigerant oil in accordance with replaced parts:
- Compressor: refer to 64 52... Instructions for compressor replacement .
- Evaporator: 10 ml
- Condenser: 10 ml
- Desiccant insert/desiccant bottle: 30 ml
- Each replaced refrigerant line: 10 ml
- Condenser with integrated dryer: 30 ml
- Safety pressure switch and seals: no additional refrigerant oil
- Evacuate and fill A/C system , see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Part replacement on account of sudden leak
(major leak, e.g. pipe break due to accident)
Work sequence:
- Draw off A/C system, then determine drawn-off refrigerant oil quantity, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .
- Carry out part replacement
- Replace removed refrigerant oil with new refrigerant oil
- Additionally
replenish 25 ml new refrigerant oil and
new refrigerant oil in accordance with replaced parts:
- Compressor: refer to 64 52... Instructions for compressor replacement
- Evaporator: 10 ml
- Condenser: 10 ml
- Desiccant insert/desiccant bottle: 30 ml
- Each replaced refrigerant line: 10 ml
- Condenser with integrated dryer: 30 ml
- Safety pressure switch and seals: no additional refrigerant oil
- Evacuate and fill A/C system , see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) .