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  #1  
Old 2nd June 2011
jcm jcm is offline
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Default Filled AC with freon but no compressor oil

After installing a new compressor, took the car to a mechanic with proper tools to energize AC system.

Mechanic did not install oil. Compressor clutch did not engage without oil. Mechanic instructed me to fill the low side with oil rather than bring it back to him. I picked up the 3 3oz cans with connection hose. Mechanic said he filled 32 lbs of freon and stated there was "room" for the oil fill.

Q's:

1. Is this a correct procedure?
2. How do I know how much of the can installed by just using a hose without gage?
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  #2  
Old 2nd June 2011
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Did the compressor contain any oil when it was installed, most new ones come filled, it is then advised to drain it and add the required amount depending on what you replaced (see below).

Draining of R134a = 20ml
Burst AC Hose = 40ml
Replacement of Hose = 20ml
Replacement of Condenser = 40ml
Replacement of Evaporator = 40ml
Replacement of Expansion Valve = 20ml
Replacement of Compressor = 70ml

I assume if the compressor was the only thing you replaced then you would have to add 90ml (70ml for the compressor and 20ml for the R134a recharge) of oil (~3ozs).
The mechanic added 32Lbs of freon, 1st off 32Lbs wouldn't fit in the system and 2ndly he shouldn't be adding freon at all ng900's and og9-3's took R134a. Do you mean he added refrigerant until the reading was 32PSI???

Anyway to answer your questions:
1. Most definitely not, I suggest taking the vehicle to a trained AC specialist or at least someone that can communicate correctly.
2. By weighing it before and after.
A completely empty system will need 725gs of R134a (~26ozs) and you use the information above to calculate the correct amount of oil.

Also I don't believe that the reason for the clutch not engaging is the lack of oil, while low (if the compressor was drained prior to install) the system should not be completely empty of oil, I suspect that the pressure is not correct and the pressure switches are disabling the compressor from running to prevent damage.
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Old 2nd June 2011
jcm jcm is offline
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Thanks for the reply Jake. He added 134a, ignor my generic freon call-out, until the guage read 32 lbs. I did not install any oil in the empty 40K mile donated compressor, left this to the pro. So there was only oil in the lines.

Shall I install a can of oil and see if the compressor kicks on? This at least will give the answer that I have a functioning unit. If I understand you right, there will be no way to know how much oil is truely in the system without weight. I thought the weight related to 134a not oil.

Perhaps you'll give another shot at guidance.
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Old 2nd June 2011
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Ok no problem on the freon thing, I assumed that was what it was, just wanted to double check, heard many a shop do a funny thing.
You should be good with just one can (3ozs) of the oil based on what was replaced and the compressor being empty that should be enough. If that doesn't solve the clutch not kicking in then I would look at the high and low side pressure readings. While the pressure reading on the low side is used has an estimate for measuring the level of R134a the 'correct' pressure reading can vary depending on outside temp and engine RPM. So it is normally advised to completely empty the system of R134a and then add the correct amount by weight.
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Old 19th June 2014
kskanna kskanna is offline
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Default removed compressor

Hello guys, I was removing the timing cover on my 2002 9-3 SE and had to take the compressor off. Don't ask me what I was thinking, I went ahead and loosened the bolt holding the lines to the compressor and it went bang psssss.
Of course I ran back into the house and the noise stopped very fast. Apparently there wasn't much in the system cos the car has been sitting for a while anyway.
My question is, now that I am putting everything back, I drained the compressor completely for a fresh start. I need to fill the oil in it before installing it. The only markings on the compressor are S D and 20C.
It's a saab 9-3 SE Convertible 2002. I got the oil from thesaabsite. Now I need to know how much to fill before fitting it back in. Then I plan to take it to a mechanic to have the system sucked out dry and fill in freon. Is that the right way to do it? Or should I follow a different procedure? Thanks for your help.
K
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  #6  
Old 19th June 2014
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See my above comment, but if the only thing removed/changed was the refrigerant and the compressor then 3 ozs should be about right, this assumes that the compressor is now completely empty of oil.

Yes a vacuum and recharge is the correct step once you have it all back together.
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  #7  
Old 19th June 2014
BobSaabit BobSaabit is online now
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If you had it open, you should also change the drier. Easy job, and you don't want moisture in there. The drier is a one shot deal - once it absorbs moisture, it's done. Replacement ($15) is always the best strategy if you've opened the system. If there is still pressure in there (you could check at the test valves) then you can just vac and charge.
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Old 19th June 2014
kskanna kskanna is offline
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Default Where to put the oil

This might sound real dumb, but is there a specific hole in the compressor to put the oil into? There are 2 holes with the green o rings on the compressor. Should I just add the oil into one of those? If so which one?
Thanks for the receiver drier. I'll do that.
Kannan
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  #9  
Old 20th June 2014
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Either hole should be fine, though I think the hole on the low side might be a little bigger and easier.
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