No, most do not contain oils and dye. You have to pay more for those than for straight refrigerant.
If you have a leak the oil will usually also leak out.
If you suspect that you have excess oil they you should drain the condenser and evaporator and compressor and flush out those components and the hoses. Then replace the drier/accumulator. The GMC maintenance manual has a chart telling how much oil to add for each component. Then evacuate and check for leaks, then recharge.
Emery Stora
>
> Emory, answering your question on why i believe there is excess oil...
>
> All of those quick over the counter a/c charge cans contain oil correct? I
> believe its oil, coolant, and dye. I know my system had a minor leak, so i
> wonder how many POs used the cheapest recharge can from kmart, only for the
> refridgerant to leak, and leave the oils/dye at low points.
>
> Again, i could be overthinking this.
>
> Will
>
> On Sat, Jun 22, 2019, 11:17 AM Emery Stora via Gmclist <
>
>> I was at Osoyoos Canada in 05. The planked salmon was fantastic!
>>
>> I did a few installs of Duracool while there.
>>
>> I agree with your statements
>> except numbers 2 and 3.
>>
>> There are times when you do need to evacuate the system. If is has been
>> open to the atmosphere so as to allow air and moisture in it should be
>> evacuated. If the system is still sealed and has pressure then most people
>> look over their shoulder to make sure the air conditioning police are not
>> looking and bleed off the old refrigerant and install Duracool. You can not
>> recover what is in there unless you have the machine to do it.
>>
>> As to working better if you don’t pull a vacuum that is exactly the
>> opposite of what I believe. It will usually work but if you leave some of
>> the old refrigerant in you will have a mixture of refrigerants and that
>> will not work as efficiently as straight Duracool. So it is best to
>> evacuate if you have a vacuum pump. If there is ang chance that there is
>> water moisture in the system that should definitely be vacuumed out.
>>
>> How can there be decades of oils built up in the system if you haven’t
>> added any oil? The oil in there doesn’t degrade.
>>
>> The only reason to flush is if you have a mixture of oils in the system.
>> They can eventually interact and form “sludge” in the system. The last time
>> I replaced a compressor, the new compressor contained oil suitable for
>> R-134a and that would be mixed with the mineral oil used for R-12. So, I
>> drained the oil from the new compressor and measured how much it contained.
>> I then flushed out the compressor with naphtha or mineral spirits a couple
>> of times and pressure blew it out with dry air. I then installed the same
>> volume I drained out with mineral oil for air conditioners from NAPA.
>>
>> By the way, it was discovered years back that R134a exposure can cause
>> testicular cancer. That would scare any man!
>>
>> Emery Stora
>> 77 Kingsley
>> Frederick CO
>>
>>> On Jun 22, 2019, at 7:03 AM, Will Albers via Gmclist <
>>>
>>> My stock compressor more or less seized, so i have a S6 replacement
>> about to go in. Would you consider a flush mandatory when swapping
>> compressors? My
>>> thought here is that there are decades of oils built up in the system
>> that should be removed. Am i over thinking it?
>>>
>>> Also, on
http://bdub.net/gmcmotorhome.info/heat.html - It states:
>>>
>>> Here are some bits of information that we learned at Osoyoos: (5/5/5)
>>> 1 AC technicians do not like to use 134, it is harmful to their health.
>>> 2 You do not need a vacuum pump to charge with Hydrocarbon refrigerants
>> like DuraCool (Propane).
>>> 3 In fact they work better if you do not pull a vacuum.
>>> 4 Propane will mix with whatever you have in your system. There's
>> nothing to change.
>>> 5 Recover the existing refrigerant (most of our systems are already
>> empty).
>>> 6 Add 3 cans of DuraCool
>>>
>>> I'm very curious about #3. The link no longer works. Does anyone know
>> why it works better without pulling a vaccum?
>>> --
>>> 1978 Palm Beach.
>>> Detroit Michigan
>>>
>>>
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