How much A/C oil to add after evacuating system
#1
How much A/C oil to add after evacuating system
Hi All,
I think my 1990 F150 may have a leak in the R-134a converted A/C system. I'll verify w/a sniffer and gages I borrowed from a friend.
Meanwhile, my question is: If I have to evacuate the system completely in order to fix the leak, how much oil do I add back in the system? I'm sure some of the oil will probably remain in the system even after evacuating it, but not sure how much. I suppose I'd rather have a little too much oil than not enough.
Thanks,
Matt
I think my 1990 F150 may have a leak in the R-134a converted A/C system. I'll verify w/a sniffer and gages I borrowed from a friend.
Meanwhile, my question is: If I have to evacuate the system completely in order to fix the leak, how much oil do I add back in the system? I'm sure some of the oil will probably remain in the system even after evacuating it, but not sure how much. I suppose I'd rather have a little too much oil than not enough.
Thanks,
Matt
#3
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don't know if anybody is interested but I have been finding some cool info on A/C systemcharges which includes oil charges. The Ford light truck charts run from 87-97
http://www.mastercool.com/media/temp_pressure_chart.pdf
http://www.mastercool.com/media/temp_pressure_chart.pdf
#7
Like I stated before, my manual shows no oil needs to be added. But I have always added a few ounces when I do an evacuate and recharge. There are more than a few Ford TSBs out there regarding too little oil in the A/C system leading to compressor failures. It's not that often I have ever pumped down a system more than once for any vehicle I have ever owned over the years, so it's not like I add oil at frequent intervals.
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#8
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Ok, you guys backed up everything I wanted to say but I figured I should wait. You add 1 or 2oz of oil for every component that is new. If the components stay in the vehicle, they will (should) have oil in them and you dont need to add more. Even if you got something (like a compressor) from somewhere else, itll probably still have oil in it. Just add a refrigerant charge and you should be good to go.
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Thanks a bunch for the answers, guys. It sounds like it's pretty unanimous that I shouldn't need to add any oil into the system if I evacuate it, as long as I am not changing out any components. If I find there is a leak, hopefully it will just be an o-ring, and won't require component change-out.
By the way, I forgot to mention the truck has been converted to R-134a, but I doubt that makes much difference to your answers.
By the way, I forgot to mention the truck has been converted to R-134a, but I doubt that makes much difference to your answers.