Where do I install PAG oil for new AC compressor?
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Results 1 to 7 of 7
Cadillac Escalade, EXT and ESV Forum - 1999 - 2006 Discussion, Where do I install PAG oil for new AC compressor? in Cadillac Escalade Forums; Hello, I have looked far and wide but I can't get a conclusive answer to my question. I have a ...
  1. #1
    Keymaster is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2008
    Posts
    11

    Where do I install PAG oil for new AC compressor?

    Hello,

    I have looked far and wide but I can't get a conclusive answer to my question. I have a 2002 Escalade. I need to replace the AC compressor. Anyone who has owned this vehicle long enough will go through this process. There is a service bulletin on this matter and it has been well documented. I also plan on replacing the dryer and the orifice tube as well.

    My main question is, where do you install the PAG oil? Let me start with what I DO know:

    I have documentation on how much PAG oil this vehicle takes (11 ounces)
    I know that you are supposed to empty oil from new compressor and re-add the remaining oil plus what you drained out. My new compressor is dry, so there is none to drain.
    I am reading that you also install some of the oil into the dryer. There is a Youtube video that documents this as well.

    What I cannot find is, what port on the compressor does the oil go? Small hole, which I believe is the high side, or the larger hole, which I believe is the low side?
    Also, which hole on the dryer does the oil go?
    Lastly, how much oil goes into each?

    I tried locating a Chilton manual at a couple of auto parts stores recently, but have not been able to find one for my vehicle. Usually these manuals are good for these types of tidbits.

    I have all the other items in place and ready to go: gauges, adapters to fit gauges to R134 lines, vacuum pump.

    Thanks in advance for any help that can be provided for this issue.

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    the cadillac man's Avatar
    the cadillac man is online now Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,224
    Quote Originally Posted by Keymaster
    Hello,

    I have looked far and wide but I can't get a conclusive answer to my question. I have a 2002 Escalade. I need to replace the AC compressor. Anyone who has owned this vehicle long enough will go through this process. There is a service bulletin on this matter and it has been well documented. I also plan on replacing the dryer and the orifice tube as well.

    My main question is, where do you install the PAG oil? Let me start with what I DO know:

    I have documentation on how much PAG oil this vehicle takes (11 ounces)
    I know that you are supposed to empty oil from new compressor and re-add the remaining oil plus what you drained out. My new compressor is dry, so there is none to drain.
    I am reading that you also install some of the oil into the dryer. There is a Youtube video that documents this as well.

    What I cannot find is, what port on the compressor does the oil go? Small hole, which I believe is the high side, or the larger hole, which I believe is the low side?
    Also, which hole on the dryer does the oil go?
    Lastly, how much oil goes into each?

    I tried locating a Chilton manual at a couple of auto parts stores recently, but have not been able to find one for my vehicle. Usually these manuals are good for these types of tidbits.

    I have all the other items in place and ready to go: gauges, adapters to fit gauges to R134 lines, vacuum pump.

    Thanks in advance for any help that can be provided for this issue.
    Everything goes in on the low side not the high side(that side is dangerous if careless)
    One can should do but I would consult with a dealers service manager before I continue

    I have a service manual and I will look and see if it has the oil amount listed

  4. #3
    TLMC is offline Cadillac Owners Member
    Automobile(s): 2003 Escalade 1969 ss396 chevelle
    Join Date
    Nov 2011
    Location
    BOYNTON BEACH,FL
    Age
    60
    Posts
    75

    Re: Where do I install PAG oil for new AC compressor?

    Drain the oil out of your old compressor and measure, that is the amount you put in the new compressor. you can put in either hole before you attach the lines it will be about 3 or 4 ounces of oil.Add about 2 ounces of oil to the dryer and you are good to go. 11 ounces is for a complete new system, you are not replacing the 2 evaporators or the condenser which all contain oil. When an a/c system is charged by an a/c machine with oil it is charged on the high side. I know I am a mechanic and have been for over 35 years.

  5. #4
    Keymaster is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2008
    Posts
    11

    Re: Where do I install PAG oil for new AC compressor?

    Quote Originally Posted by TLMC View Post
    Drain the oil out of your old compressor and measure, that is the amount you put in the new compressor. you can put in either hole before you attach the lines it will be about 3 or 4 ounces of oil.Add about 2 ounces of oil to the dryer and you are good to go. 11 ounces is for a complete new system, you are not replacing the 2 evaporators or the condenser which all contain oil. When an a/c system is charged by an a/c machine with oil it is charged on the high side. I know I am a mechanic and have been for over 35 years.
    Thanks for the reply. I found a couple of articles last night that referred to other GM vehicles that were basically identical to the Escalade (either Yukon, Denali, etc.) The literature posted said that out of the 11 ounces in the system, 3 of those were in the rear portion of the system. It said to pour 1 oz in the dryer. There is apparently an ounce that goes in the condensor, although I'm not fooling with that. That leaves 6 ounces to go into the compressor. Another article I read said to use 5 ounces in the compressor. That would give me the 11 ounces of total oil.

    My dad and I had a healthy discussion about this topic this afternoon. He works on home AC systems where the compressors come pre-filled with oil from the factory. One thing that want to understand about the ac system in my Escalade is, once the oil is poured into the different locations (dryer, compressor), does it stay there? In other words, the only thing I thought that actually circulated throughout the system is the freon. Does the 5 ounces of PAG oil stay in the compressor, or does a portion of it circulate through the lines along with the freon? And why do you need oil in the dryer?

    Thanks again for your input.

  6. #5
    Keymaster is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Dec 2008
    Posts
    11

    Re: Where do I install PAG oil for new AC compressor?

    Just a followup question. Has anyone injected the PAG oil through the low side before installing the freon? I talked to a gentleman about my situation and he recommended evacuating the system, replacing the orifice tube, putting a vacuum on the system, injecting the PAG oil into the low side and THEN adding the r134a to the low side. I was gonna take the low side hose off the compressor, use a piece of clean hose along with a funnel and pour the PAG oil directly into the compressor. Button everything up, remove the belt, turn the pulley 10-15 rotations, re-install the belt and they add the r134a.

    I'm really looking for someone who has tried this or knows from experience whether or not that much oil can be added through the low side. From what I've read, it wouldn't matter, as the oil is circulating throughout the system anyway. I would be adding about 7 oz total.

    Thank you.

  7. #6
    the cadillac man's Avatar
    the cadillac man is online now Cadillac Owners Master
    Automobile(s): 03 cadillac escalade
    Join Date
    Mar 2011
    Location
    speedwell tn,
    Posts
    7,224
    Quote Originally Posted by Keymaster
    Just a followup question. Has anyone injected the PAG oil through the low side before installing the freon? I talked to a gentleman about my situation and he recommended evacuating the system, replacing the orifice tube, putting a vacuum on the system, injecting the PAG oil into the low side and THEN adding the r134a to the low side. I was gonna take the low side hose off the compressor, use a piece of clean hose along with a funnel and pour the PAG oil directly into the compressor. Button everything up, remove the belt, turn the pulley 10-15 rotations, re-install the belt and they add the r134a.

    I'm really looking for someone who has tried this or knows from experience whether or not that much oil can be added through the low side. From what I've read, it wouldn't matter, as the oil is circulating throughout the system anyway. I would be adding about 7 oz total.

    Thank you.
    I would inject it after you put everything together and have replaced all the parts

  8. #7
    Ollie8974 is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Jun 2007
    Posts
    21

    Re: Where do I install PAG oil for new AC compressor?

    A new compressor will usually have the correct amount of oil installed.
    Ask when you purchase the compressor.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting