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Old 02-23-2021, 02:16 PM   #1
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Default AC lubricant - How much?

I have replaced the receiver/dryer and the expansion valve and do not now know if I need to add any lubricant to the system.


The FSM is quite specific on how to replace the lubricant when replacing the compressor, but I didn't see anything about how much, if any, lubricant needs to be added when replacing only the two components that I did.


Mine is a R-134a retrofit, the failure was at the expansion valve, the compressor should be just fine.


Do I need to add any lube to the system now? Where would I add it if I do have to?


Thank you.
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Old 02-23-2021, 02:53 PM   #2
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It wouldn't hurt to add some when you add the refrigerant. Some R134a has PAG oil in it already. I don't remember how much you add, it's not much, but far as I know it won't hurt anything to add the OEM recommended amount even with just replacing the bits you did.
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Old 02-24-2021, 01:46 AM   #3
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Could I add a tsp to the drier? It would be the easiest point to open.
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Old 02-24-2021, 02:37 AM   #4
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You can buy a small can at walmart. You add it to the system after it has been evacuated. Pull the vacuum first. I always start the engine, set the AC on high, add one can of freon first, then the can of oil, then top the system off with the correct amount of refrigerant. If you try to add it directly to the drier, it will be evacuated out when you pull a vacuum on the system.
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Old 02-24-2021, 03:15 AM   #5
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Okay, I see now. One more question. Will my old lubricant remain in the system after evacuating? I had it evacuated at a shop with recovery equipment and hope that I only lost whatever oil was in the dryer and the valve. I seem to recall the FSM advising against adding too much lube unless I'm confused with too much freon which I know is bad.
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Old 02-24-2021, 02:15 PM   #6
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If you had it properly evacuated at a shop there's most likely only a residual amount of lubricant in the system.
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Old 02-24-2021, 04:11 PM   #7
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Quote:
Originally Posted by cadillacdude1975 View Post
You can buy a small can at walmart. You add it to the system after it has been evacuated. Pull the vacuum first. I always start the engine, set the AC on high, add one can of freon first, then the can of oil, then top the system off with the correct amount of refrigerant. If you try to add it directly to the drier, it will be evacuated out when you pull a vacuum on the system.
Dummy question here.

I know what freon is (or R-134A), but what is a "can of oil"?

What kind of oil are we talking here?

Could someone post a URL to some such oil on Amazon?

I really don't know much other than theory about the A/C system.
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Old 02-24-2021, 05:39 PM   #8
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It's called PAG oil. When I rebuilt the AC system of my truck I poured it directly into the compressor.


https://www.amazon.com/FJC-2484-PAG-.../dp/B0002JMEJ4
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Old 02-24-2021, 11:45 PM   #9
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The oil lubricates the compressor and it is for the seals so they do not dry out.
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Old 02-25-2021, 10:11 AM   #10
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Make sure you turn on your AC occasionally and run it for a couple of minutes, even in winter, to keep the seals lubricated. Otherwise they will dry out eventually and cause leaks.
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