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how much oil and how to add?

drptop70ss on Wed April 08, 2009 8:47 AM User is offline

Year: 95
Make: chevy
Model: caprice
Engine Size: 350
Refrigerant Type: 134

Hi guys, still working on putting the 95 caprice A/C system in my 70 chevelle and I am getting stuff lined up.. How much oil should I put into the system, and is it ok to just pour the oil into the hose that runs from the accumulator to the compressor? The compressor is on the bottom of the engine and that hose would work like a funnel. I would put half the oil in the compressor and half in the accumulator.
Also the parts are used, I got out what oil I could, but can it cause damage to have too much oil in the system?

Edited: Wed April 08, 2009 at 3:01 PM by drptop70ss

Chick on Wed April 08, 2009 2:30 PM User is offlineView users profile

with the parts out, you should drain and flush the system, to much oil is not good. But the system holds 8 ounces of PAG 150 viscosity.. It's a "Guess" how much is in there.. I would drain everything, use a new accumulator and add four ounces to it, and the rest can go in the compressor or even the condenser

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

drptop70ss on Wed April 08, 2009 3:04 PM User is offline

I planned on putting mineral spirits through the evaporator, condensor, and hoses, and then blowing out with compressed air. I will get a new accumulator. Is it safe to put mineral spirits into the compressor or should I just dump out what oil I can get out?

Also the fixed orifice is in the condensor outlet tube, should I be able to pull it out easily with needle nose pliars or will it break if I try and remove it?

Edited: Wed April 08, 2009 at 3:05 PM by drptop70ss

TRB on Wed April 08, 2009 3:20 PM User is offlineView users profile

No do not put mineral spirits in the compressor. Also Icemann has reported residue mineral spirits has caused some compressor failures. Might be good to use a flushing agent like what Hecat offers as a final flush removing any mineral spirit residue.

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Chick on Wed April 08, 2009 3:21 PM User is offlineView users profile

They come right out..no problem, unless the system is contaminated, and this is something you really need to check, so pull the O tube and inspect it, then change it.. I don't use mineral spirts, they are to many types of mineral spirts for me to give you a yes or no answer.. Some commercial flushes use mineral spirts as part of their flush.. I use lacquer thinner (outside with plenty of air) on metal parts and brake parts cleaner. Today there are so many different brands of brake parts cleaner that I would be hard pressed to recommend them. Some dry fast, some slow.. Some may damage rubber hoses others will not. If you don't want to use "Hecats" flush, available right from the sponsor of this board, I can only recommend you take a piece of glass and put a drop or to of whatever you want to use on it and see how fast it evaporates, and also make sure it leaves no residue behind..

Here is a pic of the lines you should have..Take apart the fitting and pull the o-tube right out..Hope this helps..



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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Edited: Wed April 08, 2009 at 3:35 PM by Chick

drptop70ss on Wed April 08, 2009 4:39 PM User is offline

I can get the laquer thinner at home depot, so no problem using that to flush out the parts and then blow out with compressed air. For the compressor should I just dump out whatever oil I can get out of it? Unfortunately I dont have a history on it but it was part of a complete system on the car I removed it from and there were no open or broken lines.

thanks again for all the help this site is great!

Edited: Wed April 08, 2009 at 4:39 PM by drptop70ss

Chick on Wed April 08, 2009 4:42 PM User is offlineView users profile

The condition of the O tube will tell you a lot, and yes, drain the compressor and flush it with the oil you'll be using, pour it in the suction side and turn the compressor to move it around, then drain it again, and add back about four ounces, then add the other four ounces to the accumulator. hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

drptop70ss on Wed April 08, 2009 7:20 PM User is offline

o tube came out easily, looked pretty good, few small pieces of trash but certainly not clogged up or damaged. Compressor didnt give up any oil when I turned it over, does make pumping sounds when I turn the clutch by hand so hopefully it is a good one. Should I turn the clutch when I flush it with the new oil or just pour it in and back out?

Chick on Wed April 08, 2009 7:24 PM User is offlineView users profile

Turn it to work the oil in and remove any residual oil left in the nooks and cranny's.. then drain while turning and when done add the fresh oil.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

drptop70ss on Wed April 08, 2009 8:28 PM User is offline

will do, just have to pick up an S10 evaporator and I think I will be in business for assembly. Thanks to all, will post back when it is time to charge it up.

One stupid question..I work with vacuum every day in my job, and I have to say I dont understand why the oil is put into the system before pumping down. The vacuum pump should vaporize and remove the oil in order to pump down to base pressure. Shouldnt the oil be put into the system with the refrigerant after being evacuated?

Edited: Wed April 08, 2009 at 8:34 PM by drptop70ss

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