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Started By
Message
Pinging Auto A/C people.
Posted on 7/31/21 at 8:39 am
Posted on 7/31/21 at 8:39 am
Changing out the compressor on a GMC 1500.
It was charged and cooling but bearings were noisy.
The new Denso compressor instructions say empty old compressor and measure the oil you remove and add that amount in the new compressor.
The problem is I got little oil out of the old compressor. Maybe a ¼ ounce.
According to common charts the compressor should have 50% of the oil of the entire system. That should be about 4 ounces for this GMC.
Anyone know why so little oil was in the compressor?
At this point how much oil should I add to the compressor?
Thanks,
It was charged and cooling but bearings were noisy.
The new Denso compressor instructions say empty old compressor and measure the oil you remove and add that amount in the new compressor.
The problem is I got little oil out of the old compressor. Maybe a ¼ ounce.
According to common charts the compressor should have 50% of the oil of the entire system. That should be about 4 ounces for this GMC.
Anyone know why so little oil was in the compressor?
At this point how much oil should I add to the compressor?
Thanks,
6
Posted on 7/31/21 at 11:10 am to btrcj
I always put 2oz in compressor.
Then rotate compressor 10 revolutions by hand.
Never had a problem.
If old one was that low that's probably why bearings were failing
Then rotate compressor 10 revolutions by hand.
Never had a problem.
If old one was that low that's probably why bearings were failing
Posted on 7/31/21 at 11:13 am to btrcj
I have only changed out a few in the past but somehow found specs on how much to add. If you have a leak etc. How the hell would the way their suggesting be accurate?
Posted on 7/31/21 at 1:30 pm to LEASTBAY
Thanks for the reply's.
I have the Compressor and dryer changed out. The Dryer had 2.5 ounces of oil in it so i added that much in the new one.
The new compressor had a little over an ounce so added that back in and spun it.
I have not installed the hoses on the compressor yet.
If I added another ounce to the compressor that would be a total of 4.5 ounces total. That is a 63% of the 7.1 total capacity of the system. The Dryer and compressor should hold 60% of the total according to charts of oil distribution in a system.
What bothers me is we did not get any measurable amount of oil out of the old compressor so if we did add the 4.5 that would be 2 ounces over what we took out.
If it is 2 ounces over the capacity will that cause problems?
Thanks,
I have the Compressor and dryer changed out. The Dryer had 2.5 ounces of oil in it so i added that much in the new one.
The new compressor had a little over an ounce so added that back in and spun it.
I have not installed the hoses on the compressor yet.
If I added another ounce to the compressor that would be a total of 4.5 ounces total. That is a 63% of the 7.1 total capacity of the system. The Dryer and compressor should hold 60% of the total according to charts of oil distribution in a system.
What bothers me is we did not get any measurable amount of oil out of the old compressor so if we did add the 4.5 that would be 2 ounces over what we took out.
If it is 2 ounces over the capacity will that cause problems?
Thanks,
Posted on 7/31/21 at 1:50 pm to btrcj
For the love of god change the drier and condenser too. You already spent the money on a better compressor.
The instructions say to drain and measure because they assume you arent changing other components. The oil is dispersed through the system.
I always just swapped out those two items as well and rinsed my lines out with the citrus cleaner.
Then you can add the factory amount of oil to the system and pressurize.
If dead set on not changing other pieces... Make sure the denso unit isn't prefilled. My last GEO app was.
Then look up the stock fill amount and add half of what they say. It's basically guess work.
Edit: read follow up.
Yeah... You're just guessing. Over oiled isn't THAT big of a deal. Just make sure your refrigerant level is good and that you arent adding refrigerant that contains oil.
The instructions say to drain and measure because they assume you arent changing other components. The oil is dispersed through the system.
I always just swapped out those two items as well and rinsed my lines out with the citrus cleaner.
Then you can add the factory amount of oil to the system and pressurize.
If dead set on not changing other pieces... Make sure the denso unit isn't prefilled. My last GEO app was.
Then look up the stock fill amount and add half of what they say. It's basically guess work.
Edit: read follow up.
Yeah... You're just guessing. Over oiled isn't THAT big of a deal. Just make sure your refrigerant level is good and that you arent adding refrigerant that contains oil.
This post was edited on 7/31/21 at 1:52 pm
Posted on 7/31/21 at 3:06 pm to X123F45
Thanks Rondo.
I believe i am over thinking this. This cannot be that precise as you said. I am going to button it up as is.
As far as the condenser, i agree but this is a friends truck and he wants to chance it.
I did replace the orifice tube and the screen was clean so hopefully everything else is.
Thanks for everyone's help.
I believe i am over thinking this. This cannot be that precise as you said. I am going to button it up as is.
As far as the condenser, i agree but this is a friends truck and he wants to chance it.
I did replace the orifice tube and the screen was clean so hopefully everything else is.
Thanks for everyone's help.
Posted on 7/31/21 at 6:08 pm to btrcj
I did this a couple of years ago. There are tons of videos and articles on the web. Don’t forget you need to change the orifice tube while you have the system open. Also I would recommend changing all of the o-rings also while the system is open. This is one link to a guy on YouTube that I always use for info
Eric The Car Guy
Eric The Car Guy
Posted on 8/1/21 at 7:48 am to btrcj
I think you've gotten the advice on the oil above.
Most new compressors come with a card that tells you how much to put in at installation. Going by memory one I changed on my old F150 called for 4 oz in the new compressor.
As far as where did all the old oil go? If you have leaks or a blown seal on the compressor some oil leaves with the leaking refrigerant. One way to identify leaks is to look for oily residue (in addition to dye tests). Even a small leak over time can take a fair amount of oil with it.
Also as other have stated the oil is distributed throughout the system so I don't believe you would ever get back the amount of oil that was put originally in the new compressor.
Most new compressors come with a card that tells you how much to put in at installation. Going by memory one I changed on my old F150 called for 4 oz in the new compressor.
As far as where did all the old oil go? If you have leaks or a blown seal on the compressor some oil leaves with the leaking refrigerant. One way to identify leaks is to look for oily residue (in addition to dye tests). Even a small leak over time can take a fair amount of oil with it.
Also as other have stated the oil is distributed throughout the system so I don't believe you would ever get back the amount of oil that was put originally in the new compressor.
This post was edited on 8/1/21 at 8:18 am
Posted on 8/1/21 at 2:31 pm to btrcj
Yep change out the drier, orfice tube and any orings. You also need to pull a vacuum on the system before charging. It rids any moisture in the system and allows it to cool much better. When my compressor died in my hunting truck i replaced everything including lines. It blows much colder air than the factory did
Posted on 8/2/21 at 10:23 am to Guess_who
Just thought I would follow up.
The reason for replacing the Compressor was due to a noisy bearing.
I changed the Compressor, Drier, orifice tube and replaced all O-rings. Vacuumed down and added 2 cans of Freon. That is 2 ounces under spec but the pressures on both the high and low side are a little over what they were before I started so I stopped there. I can always add more if needed.
The system is cooling fine so far.
thanks,
The reason for replacing the Compressor was due to a noisy bearing.
I changed the Compressor, Drier, orifice tube and replaced all O-rings. Vacuumed down and added 2 cans of Freon. That is 2 ounces under spec but the pressures on both the high and low side are a little over what they were before I started so I stopped there. I can always add more if needed.
The system is cooling fine so far.
thanks,
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