A/C COMPRESSOR APPLICATIONS
Note. Always refer to underhood A/C specification label in engine compartment or A/C compressor label while servicing A/C system. If engine compartment/compressor label specifications differ from specifications in this article, use underhood/compressor label specifications.
| Application | Compressor |
|---|---|
| BMW | Nippondenso Or Seiko-Seiki |
A/C COMPRESSOR APPLICATION
REFRIGERANT OIL & REFRIGERANT CAPACITY SPECIFICATIONS
Note. DO NOT exceed A/C system refrigerant oil capacity when servicing system.
| Application | (1) Oil Ounces | Refrigerant Ounces |
|---|---|---|
| 3-Series | (2) 3.4-4.8 | 34.4-36.0 |
| 740iL | (2) 4.7-6.1 | 53.9-55.5 |
| (1) Total system capacity, unless otherwise noted. (2) Use Polyalkylene Glycol Oil (P/N 81-22-9-407-724). | ||
| (1) | Total system capacity, unless otherwise noted. |
| (2) | Use Polyalkylene Glycol Oil (P/N 81-22-9-407-724). |
REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY
Only NEW , moisture-free refrigerant oil should be used in the air conditioning system. This oil is highly refined and dehydrated so moisture content is less than 10 parts per million. The oil container must be tightly closed at all times when not in use, or moisture from the air will be absorbed into the refrigerant oil.
DISCHARGING SYSTEM
Discharge A/C system, using approved refrigerant recovery/ recycling equipment. Always follow recovery/recycling equipment manufacturer's instructions. After refrigerant recovery process is completed, the amount of compressor oil removed must be measured and the same amount added to A/C system.
DISCONNECTING LINES & FITTINGS
After system is discharged, carefully clean area around all fittings to be opened. Always use 2 wrenches when tightening or loosening fittings. Some refrigerant lines are connected with a coupling. Special tools may be required to disconnect lines. Cap or plug all openings as soon as lines are removed. Remove caps until connections of lines and fittings are to be completed.
CONNECTING LINES & FITTINGS
Note. All R-134a based systems use 1/2"-16 ACME threaded fittings. Ensure all replacement parts match the connections of the system being worked on.
Always use a NEW gasket or "O" ring when connecting lines or fittings. Coat "O" ring with refrigerant oil and ensure it is not twisted during installation. Always use two wrenches to prevent damage to lines and fittings.
PLACING SYSTEM IN OPERATION
After component service or replacement has been completed and all connections have been made, thoroughly evacuate system with a vacuum pump. Charge system with proper amount of refrigerant and perform leak test. See the REFRIGERANT OIL & R-134a REFRIGERANT CAPACITY table for system capacities. Check all fittings that have been opened. After system has been leak tested, check system performance.
Note. Most compressors are pre-charged with a fixed amount of refrigerant (shipping) oil. Drain compressor oil from new compressor and add refrigerant oil to new compressor according to amount removed from old compressor. Always refer to underhood A/C specification label or A/C compressor label while servicing A/C system.
NIPPONDENSO
Note. Compressor oil checking procedures not available at time of publication.
SEIKO-SEIKI
Note. Compressor oil checking procedures not available at time of publication.