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#1
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Still working on the A/C...
Now that the system has held a vacuum for a couple of weeks.... (darn
I'm lazy) I figured its time to load it up with freon and see how it goes. The only components changed out were the condensor, o-rings and schreader valves. I never really noticed any PAG oil come out of the system. Could this have been sucked out when being vacuumed down? I've seen where the suggested amount for the whole system was 6 ounces. Does the oil usually remain in the compressor or does it constantly circulate throughout? I looked for a charge can with PAG at Autozone - I think it held only 2 oz. I looked for one at Wally Mart and it had 9oz with 2oz of freon. I asked the guy at Autozone and he showed me liquid PAG in 10 oz plastic bottles.. (and there was viscocity of 70 and of 150 and also of ESTER oil (?) As far as which to use and how to apply - the "friendly experts" HAVE NO CLUE. Please. What do I use?! Do I add oil to the compressor? Forget about the vacuum and start over again by opening the system from the back of the compressor? I'm a little lost here. I could have done a more thorough job but I'm slow enough as it is and probably should get this vehicle back on the road. (WAY too hot in Texas to travel without A/C!) Thanks Guys. -WaV |
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#2
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Still working on the A/C...
On 28 Jun 2006 09:49:44 -0700, "wavy" > wrote:
>I never really noticed any PAG oil come out of the system. Could this >have been sucked out when being vacuumed down? It will not get sucked out. Ad a ounce ot two if it make you feel better but do not ad full amount as too much can ruin compressor. ----------------- The SnoMan www.thesnoman.com |
#3
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Still working on the A/C...
Agreed.
I also read today that PAG oil is hygroscopic - that it absorbs moisture. When moisture combines with 134a, it forms hydrochloric acid. Conclusion: good thing to have a dry system! Perhaps draining the old oil from the compressor and replacing it with new might not be a bad idea? (especially if I'm too lazy to replace the accumulator/dryer?) And would low viscocity oil be preferable over the 150 oil? And what IS ester oil? -THANKS AGAIN SnoMan wrote: > On 28 Jun 2006 09:49:44 -0700, "wavy" > wrote: > > >I never really noticed any PAG oil come out of the system. Could this > >have been sucked out when being vacuumed down? > > > It will not get sucked out. Ad a ounce ot two if it make you feel > better but do not ad full amount as too much can ruin compressor. > ----------------- > The SnoMan > www.thesnoman.com |
#4
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Still working on the A/C...
wavy wrote:
> Agreed. > I also read today that PAG oil is hygroscopic - that it absorbs > moisture. > When moisture combines with 134a, it forms hydrochloric acid. > Conclusion: good thing to have a dry system! > Perhaps draining the old oil from the compressor and replacing it with > new might not be a bad idea? (especially if I'm too lazy to replace > the accumulator/dryer?) > And would low viscocity oil be preferable over the 150 oil? > And what IS ester oil? I think it's very self defeating to do all that work and then (through laziness) NOT change the drier..... |
#5
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Still working on the A/C...
Yeah... well all I really did was replace the schreader valves, put on
a new condensor I paid $10 bucks for on ebay and vacuum it down. I dont really even know if the compressor is going to work. I dont want to use a perfectly new dryer if this isnt even going to work. If I replace the compressor - definately, I'll replace the dryer. -WaV Ritz wrote: > wavy wrote: > > Agreed. > > I also read today that PAG oil is hygroscopic - that it absorbs > > moisture. > > When moisture combines with 134a, it forms hydrochloric acid. > > Conclusion: good thing to have a dry system! > > Perhaps draining the old oil from the compressor and replacing it with > > new might not be a bad idea? (especially if I'm too lazy to replace > > the accumulator/dryer?) > > And would low viscocity oil be preferable over the 150 oil? > > And what IS ester oil? > > I think it's very self defeating to do all that work and then (through > laziness) NOT change the drier..... |
#6
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Still working on the A/C...
*shrug*
Pay now or pay later. Better to just do it right the first time. Cheers, wavy wrote: > Yeah... well all I really did was replace the schreader valves, put on > a new condensor I paid $10 bucks for on ebay and vacuum it down. > I dont really even know if the compressor is going to work. I dont > want to use a perfectly new dryer if this isnt even going to work. > If I replace the compressor - definately, I'll replace the dryer. > -WaV > > Ritz wrote: >> wavy wrote: >>> Agreed. >>> I also read today that PAG oil is hygroscopic - that it absorbs >>> moisture. >>> When moisture combines with 134a, it forms hydrochloric acid. >>> Conclusion: good thing to have a dry system! >>> Perhaps draining the old oil from the compressor and replacing it with >>> new might not be a bad idea? (especially if I'm too lazy to replace >>> the accumulator/dryer?) >>> And would low viscocity oil be preferable over the 150 oil? >>> And what IS ester oil? >> I think it's very self defeating to do all that work and then (through >> laziness) NOT change the drier..... > |
#7
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Still working on the A/C...
On 28 Jun 2006 16:45:33 -0700, "wavy" > wrote:
>Agreed. >I also read today that PAG oil is hygroscopic - that it absorbs >moisture. >When moisture combines with 134a, it forms hydrochloric acid. >Conclusion: good thing to have a dry system! >Perhaps draining the old oil from the compressor and replacing it with >new might not be a bad idea? (especially if I'm too lazy to replace >the accumulator/dryer?) >And would low viscocity oil be preferable over the 150 oil? >And what IS ester oil? When you vacum it down and hold it for a while it will pull the moisture out. PAG is poly-aklylene glycol (R134a will not mix well with mineral oil) and Ester il (polyol ester) is a synthetic lube that will work with R134a too. Because PAG is glycol based (like anitfreeze and brake fluid) it will aborb moisture if given a chance too. ----------------- The SnoMan www.thesnoman.com |
#8
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Still working on the A/C...
SnoMan wrote:
> On 28 Jun 2006 16:45:33 -0700, "wavy" > wrote: > >> Agreed. >> I also read today that PAG oil is hygroscopic - that it absorbs >> moisture. >> When moisture combines with 134a, it forms hydrochloric acid. >> Conclusion: good thing to have a dry system! >> Perhaps draining the old oil from the compressor and replacing it with >> new might not be a bad idea? (especially if I'm too lazy to replace >> the accumulator/dryer?) >> And would low viscocity oil be preferable over the 150 oil? >> And what IS ester oil? > > > When you vacum it down and hold it for a while it will pull the > moisture out. Not if you don't change the receiver/drier. Once the dessicant in the drier is saturated with moisture, it becomes useless. Taking it down to a vacuum MAY help a little, but it's not going to solve the problem. It is good practice to change the drier any time you've got to expose the system to the atmosphere (such as changing the condenser). |
#10
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Still working on the A/C...
On Wed, 28 Jun 2006 21:21:57 -0400, Ritz > wrote:
>Not if you don't change the receiver/drier. Once the dessicant in the >drier is saturated with moisture, it becomes useless. Taking it down to >a vacuum MAY help a little, but it's not going to solve the problem. > Somewhat true but if you oull down and hold a good vacum for a while it will remove a lot of the moisture. >It is good practice to change the drier any time you've got to expose >the system to the atmosphere (such as changing the condenser). No aurguement here, especaily with a compressor change that has trashed out because it acts as a filter of sorts to and replacing it gets the trash out of the system. ----------------- The SnoMan www.thesnoman.com |
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