boxerbob Posted June 25, 2008 Share Posted June 25, 2008 This is my nieghbors car, i put an air compressor in for him, he bought it used. it looked dried up no oil came out of it, i thought he bought a cheap rebuilt one but no, so i got him to buy the ester oil for it which is the universal a/c oil where as pag is to be matched to manufacture. anyways i read the book, said to put in as much oil as you get out of the old so 2oz came out, but i knew there was more, added 3oz+. reinstalled all bolts made sure the Orings were still present, tightened everything down good. went to store got a recharge kit. started car turn on air, added can of refrig it was fine. blew cold and no drama. still low so i added 2nd can. once it was half done taking the 2nd can it started squeling real bad and looked like this clutch was locking up too. i tightened all belts right. no more than 1in per 12in gap. looked at belt for a/c and it looked worse than when i seen it last so i think the belts bad now too. there is red dust coming from this compressor by the clutches just like the original. he texted me today, no air and it squels worse. any ideas? Link to comment Share on other sites More sharing options...
idosubaru Posted June 26, 2008 Share Posted June 26, 2008 the good thing is that the squealing is telling you what the problem is, just need to look at it. the bad thing is that it's squealing! could be a loose belt, the clutch is bad, or the bearings are bad. the bearings are replaceable on the car. does it squeal all the time or only w/ a/c on? is the belt slipping over the pulley at all? is the clutch properly engaging? i'm guessing some part of the compressor assembly is bad. you could try and track down if the bearing or clutch is bad and possibly swap in parts from the old one. but that is mucho-annoying. Link to comment Share on other sites More sharing options...
OB99W Posted June 26, 2008 Share Posted June 26, 2008 Ummm, in addition to all the things that Nipper pointed out, I don't see any mention in the original post of the system having been evacuated before being charged. Link to comment Share on other sites More sharing options...
idosubaru Posted June 26, 2008 Share Posted June 26, 2008 I don't see any mention in the original post of the system having been evacuated before being charged.this doesn't typically cause immediate failure or issues though. but it is a good point and i'd follow up with the question how/why did the old compressor fail? if it spilled guys into the existing system, which was never cleaned, then those parts may be causing fun things to happen in the new compressor. Link to comment Share on other sites More sharing options...
idosubaru Posted June 26, 2008 Share Posted June 26, 2008 With compressors it takes a shockingly small amount of oil to seize them.if you end up replacing the compressor again i'd take note of what nipper said here for the next one. that must be why most of the a/c stuff i've read says you're better off underfilling than overfilling. it usually suggests the existing oil in the system is typically enough for a one time compressor replacement and to add very little to a new or used replacement compressor. unless you chemically treat and remove all the oil or replace things with new there's little need to add anywhere close to the full amount of oil. Link to comment Share on other sites More sharing options...
OB99W Posted June 26, 2008 Share Posted June 26, 2008 I don't see any mention in the original post of the system having been evacuated before being charged. this doesn't typically cause immediate failure or issues though. but it is a good point and i'd follow up with the question how/why did the old compressor fail? if it spilled guys into the existing system, which was never cleaned, then those parts may be causing fun things to happen in the new compressor. I was primarily mentioning the possible lack of evacuation as an additional indicator that proper procedure wasn't being followed. However, if there was sufficient moisture in the system, and especially if the desiccant in the receiver-drier was already at or near saturation, there can be internal freezing. Even if that doesn't happen, moisture reacts with the refrigerant, resulting in acid formation and eventual damage. Link to comment Share on other sites More sharing options...
boxerbob Posted June 26, 2008 Author Share Posted June 26, 2008 well i did it the best i could follow and i evacuated it right. books and hillbillys only know so much. anyways i talk to my pops who was a mechanic for many years. he said it could have took in to much refrig which i think is what did happen and to release some. it didn't start acting like that until it took over a pound, usually it wont take more than it needs but so often they do. He would have said something if i did something really wrong. also i might add i never said i did it perfect, just the best a back yard guy can do. plus thats what the guy gets for buying a 80k mile compressor. if it was new like i told him to do and stop being cheap after selling another car for 3500. i could have pin pointed it to me and easily take the blame. Link to comment Share on other sites More sharing options...
OB99W Posted June 26, 2008 Share Posted June 26, 2008 well i did it the best i could follow and i evacuated it right.[...] Note that I didn't say the system hadn't been evacuated; I said that there was no mention of it having been done, and I also said that if it hadn't been done, sufficient moisture could result in internal icing (which can damage the compressor if there's blockage). Here's some info that might be useful: http://www.aa1car.com/library/ac98.htm http://www.aircondition.com/tech/questions/82/ http://www.autoacrepairs.com/gauge_reading_and_diagnosis.htm http://endwrench.com/images/pdfs/ACTheory.pdf http://endwrench.com/images/pdfs/ACMechanism.pdf http://endwrench.com/images/pdfs/Service07MayEW.pdf Link to comment Share on other sites More sharing options...
boxerbob Posted June 27, 2008 Author Share Posted June 27, 2008 well got a daylight look at it. took to much in. it was past the red zone for the gauge. i didn't finish it up til after dark when i put it in. thats when it started the noise so i didn't think to check it. let some off and its better than factory temp's. no noises, smooth engagement. so this is a reminder to all, it acts like its locking up after filling, it backing up from to much pressure. when my pops did out 5.0 it only took as needed, only reason i didn't think of it. Link to comment Share on other sites More sharing options...
boxerbob Posted June 27, 2008 Author Share Posted June 27, 2008 Note that I didn't say the system hadn't been evacuated; I said that there was no mention of it having been done, and I also said that if it hadn't been done, sufficient moisture could result in internal icing (which can damage the compressor if there's blockage). Here's some info that might be useful: http://www.aa1car.com/library/ac98.htm http://www.aircondition.com/tech/questions/82/ http://www.autoacrepairs.com/gauge_reading_and_diagnosis.htm http://endwrench.com/images/pdfs/ACTheory.pdf http://endwrench.com/images/pdfs/ACMechanism.pdf http://endwrench.com/images/pdfs/Service07MayEW.pdf thanks, i guess i've looked at those pages at some point , it has the first one purple for my screen! feel better knowing i didn't actually mess it up. know more than i trusted myself to Link to comment Share on other sites More sharing options...
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