Automotive Air Conditioning Information Forum (Archives)
How much oil should be recovered ?
pinch on 
Fri July 01, 2011 9:39 AM 
I use a Ariazone 5001 servicestation which recovers the refrigerent and seperates the oil from it.
Now I have had some cars who pull in with working ac just wanting to top it up.
I connect the hoses direct after they stop the engine and recovers the refrigerent and there is no oil seperated ?
How much oil should come from a working system when recoverying ?
Remember reading somewhere that its low on oil if there isnt any in the recovered refrigerent ?
So how much should one add if that occurs ?
TIA Pinch
HECAT on Fri July 01, 2011 10:02 AM
Recovery machines and vehicle systems are different. Oil will only come out when suspended in the liquid refrigerant. If a recovery unit draws in slowly and/or from a high spot on a system, there would be almost no oil removal. If the recovery machine recovers quickly (like newer ones do) and/or from a lower spot in a system, there can be some oil removal. Some technicians can become comfortable enough with their equipment to use the amount removed as an indicator of too much or too little oil in the vehicle system; but it is still no more than the educated guess. Just to recover and recharge, I would add back the same amount as the machine separated plus 1 oz.
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pinch on Sat July 02, 2011 4:00 AM
The machine is brand new, and I too are brand new to automatic servicestations.
So, if the machine doesnt recover any oil I can just add 1 oz to be safe ?
HECAT on Tue July 05, 2011 11:57 AM
If you are just doing the "suck and fill" then yes, to be safe. Hoses, shaft seals, compressor body seams, and other leaks often show traces of oil; so some is being lost with the refrigerant. Best to fix the leaks.
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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.
FLUSHING TECHNICAL PAPER vs2.pdfÃÂ
pinch on Wed July 06, 2011 2:07 AM
Ok, thanks for your help.
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