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2oz oil charge not being sucked into AC low side
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<blockquote data-quote="tyromeo55" data-source="post: 3576590" data-attributes="member: 1719"><p>Without seeing or touching the vehicle I can only express my thoughts. These thoughts are typed hastily so hopefully they make some sense.</p><p></p><p></p><p>Most people have no idea the ins and outs of these systems. They know a little and assume the rest. This is also true for a lot (not all) of resi HVAC techs and the internet is full of armchair warriors. Auto shops do a couple tests, replace a list of parts and then let a machine do the rest. This is good because at the end of the day they repaired the problem and the customer does not return unhappy. the only issue is that it can be expensive.</p><p></p><p><span style="color: #ff4da6">QUOTE=sh00ter I had a system leak with visible leaking oil on the hose. I let it go until the compressor got hot and noisy. <span style="color: #000000">Without seeing it I cant say for certain but (on modern systems) a little leaked oil often looks like a ton. It is super thin stuff. Once inside the system It is really hard to remove even if you are trying. It also collects all over the system like in the drier and coils. I bet it was still ok<span style="color: #ff4da6">. <span style="color: #000000">The oil is circulated inside the freon. If you were running it while it was low then you were also starving the compressor for oil. for that reason some MFG's put low pressure switches on the suction line to interrupt the compressor if it gets really low but that is not the majority. </span></span></span>I removed the compressor as the system was empty by then of refrigerant and opened up the compressor and no oil came out. <span style="color: #000000">That does not mean the system is out of oil</span> I filled the compressor with what I believe to be the correct amount of oil assuming the entire system was dry since the compressor was. <span style="color: #000000">Unless replacing the compressor and drier I never add oil. and I make sure that the new compressor is not pre-charged. A buddy double charged his ranch wagon and it would never run right. the more room you occupy with oil the less room there is for freon. The only fix was replacing the compressor and drier to start over. Sad. It was a completely brand new system. </span> Then I reassembled, with the leak fixed and pulled a vacuum to remove the moisture <span style="color: #000000">this is also done to remove non condensable gases =) .</span>. Then I re-charged the system with the correct amount of refrigerant and the compressor <span style="color: #000000">By weight? </span>was still noisy, <span style="color: #000000">IF it has a lot of miles on it and you ran it low on freon for a while then that might be why it is noisy. If IT cools good anbd you can tolerate the sound I would leave it alone</span> but it was cooling good again. I decided that maybe I needed to add a little more oil just to be sure so i was trying to add it with the charge can using my gauges. <span style="color: #000000">Aside from adding oil it sounds like you did ok to me (maybe I would of added .5 to 1 oz but that is it) That drier probably needs to be replaced but not until you get a new compressor. Also next time you open one up go ahead and look at the orifice and screen. make sure there is no debris </span></span></p><p></p><p><span style="color: #ff4da6"><span style="color: #000000">Bonus, Make sure you match oil types. Not all oils play well with others even if they are the same chemistry. (like mineral oil. there is water soluble type and non) POE oil can be mixed with pag (as far as Im concerned) but it is VERY water hungry so don't add it to an open system until you are ready to vac and charge immediately after</span></span></p><p></p><p><span style="color: #ff4da6">I got a new compressor and the other stuff that should be replaced, but this is my beater and as long as it is still cooling, I am going to run the hurt compressor for awhile and save the new parts for now. <span style="color: #000000">That is probably what I would do also.</span></span></p></blockquote><p></p>
[QUOTE="tyromeo55, post: 3576590, member: 1719"] Without seeing or touching the vehicle I can only express my thoughts. These thoughts are typed hastily so hopefully they make some sense. Most people have no idea the ins and outs of these systems. They know a little and assume the rest. This is also true for a lot (not all) of resi HVAC techs and the internet is full of armchair warriors. Auto shops do a couple tests, replace a list of parts and then let a machine do the rest. This is good because at the end of the day they repaired the problem and the customer does not return unhappy. the only issue is that it can be expensive. [COLOR=#ff4da6]QUOTE=sh00ter I had a system leak with visible leaking oil on the hose. I let it go until the compressor got hot and noisy. [COLOR=#000000]Without seeing it I cant say for certain but (on modern systems) a little leaked oil often looks like a ton. It is super thin stuff. Once inside the system It is really hard to remove even if you are trying. It also collects all over the system like in the drier and coils. I bet it was still ok[COLOR=#ff4da6]. [COLOR=#000000]The oil is circulated inside the freon. If you were running it while it was low then you were also starving the compressor for oil. for that reason some MFG's put low pressure switches on the suction line to interrupt the compressor if it gets really low but that is not the majority. [/COLOR][/COLOR][/COLOR]I removed the compressor as the system was empty by then of refrigerant and opened up the compressor and no oil came out. [COLOR=#000000]That does not mean the system is out of oil[/COLOR] I filled the compressor with what I believe to be the correct amount of oil assuming the entire system was dry since the compressor was. [COLOR=#000000]Unless replacing the compressor and drier I never add oil. and I make sure that the new compressor is not pre-charged. A buddy double charged his ranch wagon and it would never run right. the more room you occupy with oil the less room there is for freon. The only fix was replacing the compressor and drier to start over. Sad. It was a completely brand new system. [/COLOR] Then I reassembled, with the leak fixed and pulled a vacuum to remove the moisture [COLOR=#000000]this is also done to remove non condensable gases =) .[/COLOR]. Then I re-charged the system with the correct amount of refrigerant and the compressor [COLOR=#000000]By weight? [/COLOR]was still noisy, [COLOR=#000000]IF it has a lot of miles on it and you ran it low on freon for a while then that might be why it is noisy. If IT cools good anbd you can tolerate the sound I would leave it alone[/COLOR] but it was cooling good again. I decided that maybe I needed to add a little more oil just to be sure so i was trying to add it with the charge can using my gauges. [COLOR=#000000]Aside from adding oil it sounds like you did ok to me (maybe I would of added .5 to 1 oz but that is it) That drier probably needs to be replaced but not until you get a new compressor. Also next time you open one up go ahead and look at the orifice and screen. make sure there is no debris [/COLOR][/COLOR] [COLOR=#ff4da6][COLOR=#000000]Bonus, Make sure you match oil types. Not all oils play well with others even if they are the same chemistry. (like mineral oil. there is water soluble type and non) POE oil can be mixed with pag (as far as Im concerned) but it is VERY water hungry so don't add it to an open system until you are ready to vac and charge immediately after[/COLOR][/COLOR] [COLOR=#ff4da6]I got a new compressor and the other stuff that should be replaced, but this is my beater and as long as it is still cooling, I am going to run the hurt compressor for awhile and save the new parts for now. [COLOR=#000000]That is probably what I would do also.[/COLOR][/COLOR] [/QUOTE]
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