If you have a new compressor do you have to add oil into its the reservoir or do you add it through 2 cans of oil that I currently have that are injected through the service port. Need help soon since I'm vaccuming the system right now..

 

It's always best to drain the compressor and then add the proper amount of oil. Then you know what you have. I've seen compressor come empty, full and with the improper amount of oil. These suckers are too expensive to leave it to chance.

 

Alright.. I'm thinking my VIR valve is clogged.. what does it mean when the pressure on the high side is = to the pressure on the low side?

 

Is the compressor operating? Either it's not functioning (no power to it) or it's shot.

 

Sorry' I misread your question. You can add oil through the manifold ports (where the hose bolts up at the back of tghe compressor) or through the drain plug with the comprssor off the car and inverted.

 

The compressor is brand new ;-; and now its making a suction on the low side and pressure on the high.. I dunno.. its starting to worry me.. I don't want to hurt my little compressor

 

Also yeah the compressor is activating.. but if you attempt to put any freon in it it acts as though its over charged.. But i've only added a can of oil to the system and a can of freon.

 

So would it be a bad thing that the system is pulling a vaccum on the lowside?

 

Put more freon in slowly till you get around 25psi on the low side. Then let is run a while, then very slowly add more till the evap inlet becomes moist.

 

It's tough to follow your progress as you have so many very basic questions. There is no way for me to know if every step you've taken with this project has been done correctly. If you are pulling a vacuum on the low side, and the high side pressure is also low, you are low on freon. Your car holds 48 ozs of freon and that is what you should put in. I don't know where you stand on oil as you say you are now adding oil. You had a chance to put the proper amount of oil in when the system was open. Further, there is a proper way to charge the system with freon, which first must be properly pumped down with a vacuum pump.

It sounds like you don't know how much oil or freon your system now has in it. I don't mean to rain on your parade, and I admire your courage, but in a prior post you indicated you knew nothing about a/c except how to bolt up parts. A/C is nothing to fool around with. I suggest you take it to a pro before you do some major damage to it or yourself. Good luck!

 

You're absolutely right, but I have a feeling it's a little late.

 

I pulled a vaccum of 30psi for over an hour and 30 minutes. I let it sit for 15 minutes to see if it held vaccum and it did..On the oil I just didn't know if I had to take the bolt out of the bottom of the compressor or if I could really pour it into the lowside port in the back. The old one allowed oil to flow out the back but the old one also was bad. I've only added a single can of freon when it was showing PSI levels way above the norm for being the low side and the highside everytime I had messured it was creating the same amount of pressure. But then after I turned the car off worried something was clogged or wrong.

I messured the sides and they went back to being equal but a lot lower. Which I've always been told is right to be equalized. I started it one last time after tapping the VIR valve with a wrench and now the low side is pulling vaccum and the highside measurement I don't remember. I really didn't think I had done anything wrong considering everything had bolted up well and the system had vaccumed out great. Had a little mositure come out but not very much. Got a lot of oil out of the condenser as well. So I dunno I guess I'll try taking it to someone..

I added 4 oz of oil in it and I was told from the parts store that the compressor had 4oz. I remember being told that 8oz was the right mreasurement for the compressor.. So it should have a measurement of 8 oz. But hell I dunno.. I can't find a book or anything with the proper measurements of oils for it.. I have basically went off what people tell me on that section.

 

Also the reason I've avoid taking it to a shop is because they always want to redo the entire system from the condensor to the evap and they want over 800 dollars to do it.. So I really in a way wanted to avoid going through paying 800+ for a compressor and VIR valve to be done..

 

I pulled a vaccum of 30psi for over an hour and 30 minutes


I agree, may be a little late. I hope not.
Good luck.

 

Well I mean the compressor hasn't sezed or anything and it ran great the last time I was getting pressure readings. And the fact that when I tapped the VIR valve with a wrench and I got a completely different reading. Wouldn't that mean theres something wrong with the VIR valve? Its an A6 compressor to.. since I never did mention that..

 

It's very hard to say if anything is wrong with your system or whether it just needs the proper amount of freon. As for the oil, the only way to know for sure is to drain it (off the car) by removing the drain plug on the buttom of the compressor. It can be refilled through the ports where the hose bollts up or through the drain port. When your charging the system with freon, be sure to blead the hose of air so that air, which contains moisture, will not be introduced into the system.
To learn more about a/c, see if the local high schools in your area have adult education with courses in auto air. I took a few of these courses and saved a ton of money and also made some by working on other peoples cars. Good luck.

 

Well.. what I did now was take Jud Chapin's idea of taking the compressor back off draining all the oil and ensuring it to be an exact measurement. So I did that went and bought brand new pag 150 oil and put it in. I also insured it was still alright and such by turning the clutch wheel 5 times. It was still pumping like it was attempting to create pressure pretty well. And the clutch wasn't free floating or anything. It still has pep in it. So I put it back on.. Now I'm thinking about investigating this VIR valve. I'm thinking its bad because I put a new bag and stuff on it thinking I could rebuild it because I was trying to keep it as original as possible ,but I guess it needs a completely new valve.

 

Well, now I'm confused as I thought you stated in another post that you were installing a new VIR valve. In any event, I was going to ask this question before but I just assumed you were using R12 freon as you didn't mention converting to R134A. If you are using R12, you should not use pag oil as it is not compatable with R12 freon or its oil (525 viscosity mineral oil). If you are switching from R12 to R134a, you must be sure to flush the system to remove the different type of oil and then add the proper amount of pag oil for the ENTIRE system (11 ozs.). If it had been converted previously to R134a, you'll be fine with the pag oil. As I mentioned previously, it's hard to help you as I don't know what you've done.
In short, here's what I would do if I were you. I'd install the new VIR and get the correct and proper amount of oil in the system for the freon you will be using. I would then talk to a nearby shop and tell them exactly what you have done and have them finish the job. While they won't guarantee the job, if everything was done correctly, you should be in good shape when they're done. You could pump the system down for a half hour or so and then shut the guages and pump off for around 15 minutes to be sure there are no leaks before you take your car in.

 

a couple of last suggestions. I would not convert your '75 to R134a as generally such systems will not cool as well as R12. Also, be sure to check your hood weather stripping at the rear of the hood where it meets the firewall cowling. If it is not sealed properly there, hot air from the engine will enter the a/c ducts and very negatively effect a/c output. To check the seal, put greese on the weather stripping, shut the hood, and then open it and see if the greese has good contact with the sealing area. If not, be sure to replace the weather stripping. You'd be amazed at temperature difference this can make. Good luck with your a/c project and let us know how you make out.

 

Yeah I was installing a new one.. but one that I had thought I lined up apparently wasn't and it stripped out. The fitting was alright just the threads inside the VIR were buggered up. I feared that if I put it on it wouldn't seal to make a vaccum so I took all the new parts.. bag, seals, filter, canister, and top piece and put it on the old one after cleaning the it up . I found a place to offers rebuilt VIR's for 65 dollars so I'm thinking of buying a new one again and this time going over the thing with fine tooth comb before bolting it on..

Also sorry that I'm so confusing.. I tend to be bad about that.. Thanks for trying to help me though. I appreciate it.