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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.

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Old 06-29-2009, 07:48 PM   #1
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Nissan 240sx S13 Air Conditioning:compressor oil, lines, fittings and more

Click on the link to see the complete article with images check it out here: Nissan 240sx Air Conditioning: compressor oil, lines, fittings and more. Garage411.com


FYI: DO NOT exceed AC system refrigerant oil capacity when servicing system.
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.


Discharge AC 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 AC system.


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. DO NOT remove caps until connections of lines and fittings are completed.


FYI: 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 2 wrenches to prevent damage to lines and fittings.


After component service or replacement has been completed and all connections have been made, evacuate system thoroughly with a vacuum pump. Charge system with proper amount of refrigerant and perform leak test. Check all fittings that have been opened. After system has been leak tested, check system performance.

FYI: 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 AC specification label or AC compressor label while servicing AC system.

Click on the link to see the complete article with images check it out here: Nissan 240sx Air Conditioning: compressor oil, lines, fittings and more. Garage411.com

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Old 04-09-2010, 12:43 AM   #2
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ok now i know the process, thanks for these tips. btw, what if the a/c compressor is not isolated before the removal? can u also suggest some special tools required to disconnect refrigerant lines? thanks a lot!
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Old 07-17-2012, 09:29 PM   #3
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I have a question: what is the bolt thread and pitch for connecting the AC lines to everything, as I don't have them
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240sx air condition, garage411.com, s13 air conditioning

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