kevinrea Posted January 14, 2006 Report Share Posted January 14, 2006 hi guys, i was looking to flush out my ac system while i am replacing parts. I talked to one AC Service place and they said that they use denatured alcohol. has anyone heard of this being used ? Also, i went to purchase some pag oil today, and there were 3 different weights of oil. 90/100/and i think 150. ., the 150 was the only one that said it was approved for GM , so I purchased it. is this the right weight oil ? thanks, kevin Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 14, 2006 Report Share Posted January 14, 2006 Kevin (KHE) is our AC expert I am sure he will stop in here. He told me about this place for flush, o-rings, etc. I used the flush off of this site, Mike http://www.acsource.com My AC place actually said they use brake clean for flushing... I had a compressor go bad internally and it clogged my orifice tube. I replaced my accumulator, condenser, orifice tube and compressor along with all o-rings and a couple of sensors. Here is a picture of my orifice tube... AC Source sells a complete o-ring set.... Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted January 14, 2006 Report Share Posted January 14, 2006 PAG-150 is the correct viscosity of oil for GM vehicles with R-134a systems. What parts are you replacing? A little background information would be helpful as you may not need to flush the system. A/C flush solvent will work or you can use a brake clean spray (make sure it doesn't leave a residue - spray it on a piece of glass and let it evaporate - if there is no residue, it will be fine.) Do not flush the accumulator. Any connection that you open up should get a new o-ring during reassembly. Lube the o-ring with 525 viscosity mineral refrigerant oil or "Nylog". Do not use the PAG oil to lube the o-rings. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
kevinrea Posted January 14, 2006 Author Report Share Posted January 14, 2006 i am replacing the accumulator and the expansion tube/valve. i am replacing these because i have blockage in the ac. i am reading a good low pressure, but hardly any high pressure. as for lubing the o rings, i have read several articles on the net that say to use PAG oil.., so, now I am wondering which to use. kevin Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 14, 2006 Report Share Posted January 14, 2006 I lubed all my o-rings with Nylog as per Kevin, see it here: http://www.acsource.com/index.asp?PageActi...PROD&ProdID=185 My AC shop, for some reason raised an eye brow when I said I used it, but I trust Kevin (KHE) fully. If you are getting debris in your orifice tube (expansion valve equivalant) you must have a problem with your compressor, as I did with my 96 Deville. My compressor and entire system was dry as a bone with not a drop of oil in it, and black soot and metal filings were all over the system. Since the type of condenser in our cars is so hard to flush out (Kevin will explain) I replaced mine. If I were you, I would depressurize your system (either yourself or at a shop) and pull your orifice tube and see what your find trapped in it, I showed a picture of mine above... At that point you can determine how bad your system really is. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
kevinrea Posted January 14, 2006 Author Report Share Posted January 14, 2006 ok.. i will get that stuff then to do the o-rings with. kevin Link to comment Share on other sites More sharing options...
KHE Posted January 14, 2006 Report Share Posted January 14, 2006 GM air conditioning systems use a fixed orifice tube (OT), not an expansion valve. If your OT is plugged, the compressor is probably dead. I would say it's dead just by your description of the pressure readings.... It is well known in the automotive AC trade that you do not use PAG oil to lube o-rings. Use 525 viscosity refrigerant oil (R-12 mineral oil) or Nylog. It sounds like you need to order a new compressor and condenser - you can't flush all the crap out of a parallel flow condenser. Maybe it's possible but if ANY crud remains, say "Bye-Bye" to the new compressor in short order. I recommend buying a new Delphi compressor from either gmpartsdirect.com or gmotors.com. Do not use a chain store remanufactured compressor as they are typically junk and my expierence has been that they will fail prematurely and you'll be redoing the job. Post your progress. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 15, 2006 Report Share Posted January 15, 2006 I bought my compressor from Brasington at http://gmotors.com for $260, Mike Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
kevinrea Posted January 15, 2006 Author Report Share Posted January 15, 2006 Hi Kevin, thank you for taking so much time trying to help me. How would I know if the compressor is bad ? I am going to be doing this with a friend of mine that is a retired diesel mechanic that specialized in air conditioning systems. he says what he ran into all the time with truck ac systems that exhibited the same symptoms as my eldorado is having is blockage in the expansion tube and to replace the drier at the same time. kevin Link to comment Share on other sites More sharing options...
kevinrea Posted January 15, 2006 Author Report Share Posted January 15, 2006 you still there kevin ?? Link to comment Share on other sites More sharing options...
kevinrea Posted January 15, 2006 Author Report Share Posted January 15, 2006 this is for my 97 eldorado., i was wondering what the proper way to flush my system would be using an aerosol flushing unit such as this one : http://www.acsource.com/index.asp?PageActi...ROD&ProdID=1245 that is, what do I disconnect, where do I blow it into and stuff like that. thanks, Kevin Rea kevinrea@adelphia.net Link to comment Share on other sites More sharing options...
KHE Posted January 15, 2006 Report Share Posted January 15, 2006 If there is a blockage in the system, there is only ONE source for the debris...the compressor piston components. Your readings on the high and low pressure side indicate a total failure of the compressor - very low high-side pressure and somewhat normal readings on the low side. You should replace the accumulator (large metal can that contains dessicant material) as well. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
KHE Posted January 15, 2006 Report Share Posted January 15, 2006 That will work, but I think you will need more than one can to do your system. You might want to buy a refillable flush gun and a gallon of solvent. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 15, 2006 Report Share Posted January 15, 2006 Please try to keep related posts together in the same thread so that OTHERS can benefit from your experience That will work, but I think you will need more than one can to do your system. You might want to buy a refillable flush gun and a gallon of solvent. You are right about that Kevin, I ran out of flush and could have used more, I used the flush gun Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
kevinrea Posted January 15, 2006 Author Report Share Posted January 15, 2006 Ok Kevin.., so, i am removing the drier and the expansion tube.. where should i flush it from., where do i insert this at ? just at the low suction port as if I was charging the system ? kevin Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 15, 2006 Report Share Posted January 15, 2006 Every line must be disconnected and they must be flushed individually along with the evaporator that must be flushed by itself. Hold you finger over the end of the line to build up pressure and release it to blow the flush through. Use compressed air to blow out the flush and again hold your finger over the end to build up pressure and then release it to blow out the flush and to dry the line. Two people makes flushing easier. The evaporator is the hardest component to flush and to blow out with compressed air. When you think you have all of the flush out of the evaporator use compressed air again to clear it out. Replace every o-ring and use nylog on them. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
kevinrea Posted January 16, 2006 Author Report Share Posted January 16, 2006 thanks guys. kevin Link to comment Share on other sites More sharing options...
kevinrea Posted January 17, 2006 Author Report Share Posted January 17, 2006 Ok Kevin. I am going to replace the accumulator, the compressor and the expansion tube. when everything is apart , I will flush it out.. which means I will flush the hoses, the condenser, the evaporator, ... do you think this covers it all ? Kevin Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 17, 2006 Report Share Posted January 17, 2006 Kevin stated this above: It sounds like you need to order a new compressor and condenser - you can't flush all the crap out of a parallel flow condenser. Maybe it's possible but if ANY crud remains, say "Bye-Bye" to the new compressor in short order. Replace the condenser also... Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
KHE Posted January 17, 2006 Report Share Posted January 17, 2006 Ok Kevin. I am going to replace the accumulator, the compressor and the expansion tube. when everything is apart , I will flush it out.. which means I will flush the hoses, the condenser, the evaporator, ... do you think this covers it all ? Kevin It is really tough to fush a parallel flow condenser - you'll never get all the crud out of it. I would just replace it. While everything is apart, flush the evaporator, and all lines/hoses. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
kevinrea Posted January 17, 2006 Author Report Share Posted January 17, 2006 Ok.. I will also replace the condenser. I was also wondering., is there some type of an inline filter somewhere near the compressor for the high side on my 97 eldorado ? i was talking to my friend, and he said that a lot of ac systems he has done have some sort of a filter inline that needs to be cleaned out.. kevin Link to comment Share on other sites More sharing options...
kevinrea Posted January 17, 2006 Author Report Share Posted January 17, 2006 hey kevin, looking at the following picture from the service manual for my 1997 eldorado., where exactly is the expansion tube located ? that is., is it in tube #1, or tube #3, or where ? thanks, kevin rea Link to comment Share on other sites More sharing options...
Ranger Posted January 17, 2006 Report Share Posted January 17, 2006 I think he may be talking about the orifice tube. It is inline between the low and high side pressure sensors. Link to comment Share on other sites More sharing options...
Ranger Posted January 17, 2006 Report Share Posted January 17, 2006 I think it's #3. Maybe this link will help. http://caddyinfo.ipbhost.com/index.php?sho...ice%20tube&st=0 Link to comment Share on other sites More sharing options...
KHE Posted January 18, 2006 Report Share Posted January 18, 2006 Other than the screen on the orifice tube, there is no inline filter. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
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