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finding leak without wasting R 12

Boomer_106 on Tue May 05, 2009 10:58 PM User is offline

Year: 88
Make: Chevy
Model: Iroc
Engine Size: 5.7
Refrigerant Type: R-12
Country of Origin: United States

I was searching around for answers. I came across an answer at the bottom of this post by mk378

http://www.autoacforum.com/messageview.cfm?catid=2&threadid=20053

I havent taken a gauge reading yet. I'm almost positive I have a leak since it doesn't cool at all and, I have had to charge it before. I will be taking a gauge reading. What I want to find out is instead of filling with R12 and dye to look for my leak, can I use a substitute like mk378 says? If so, how do I go about this? Won't it hurt the system to put something other than what is intended in it? Would I be better off to just convert to 134a price wise?

Is there any place other than ebay to buy R-12? It's going for about $25 a can 12 or 14oz on ebay.

I do have an electronic leak detector. I'm not sure how accurate it is. It's a Blue Point ACT 725.

I've got gauges, and a vacuum pump. I've got a dye kit on the way.

Once again, my main question is... about mk378 post about using dry air, nitrogen, or R134a to fill the system so I can use dye to look for a leak? This is my first attempt at AC repair

webbch on Wed May 06, 2009 12:16 AM User is offlineView users profile

I've only done it once myself, but yes you can pull out the R12 and put in a little R134a and then pressurize with Nitrogen. The downside is spending $100+ for a small cylinder of nitrogen, plus another $30-40 for a nitrogen regulator. I keep telling myself it'll payoff over the next few uses ;-)

Key point - don't run the system with the R134a in there.

Boomer_106 on Wed May 06, 2009 12:50 AM User is offline

100+ 30-40 Maybe I should just buy R12 and be done with it or convert

GM Tech on Wed May 06, 2009 8:55 AM User is offline

Do you have an oil sling line on the underside of your hood? Very common for shaft seal leakers to spray out onto nearby objects. Is the clutch driver oily/greasy? My money is on the shaft seal- needs a new double lip style......

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Chick on Wed May 06, 2009 7:56 PM User is offlineView users profile

See if you have any pressure left in the system. If you do, I agree with GM tech that the shaft seal is suspect, put a shower cap over it and check with your electronic leak detector after a half hour or so. I bet it goes nuts when you stick it under the shower cap.. Check out new and reman R4 compressors from Ackits.com. Or you can buy the tools and change the shaft seal yourself. There is a thread on the tips and FAQ forum showing how to do this along with part numbers etc.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Boomer_106 on Wed May 06, 2009 10:05 PM User is offline

Quote
Originally posted by: GM Tech
Do you have an oil sling line on the underside of your hood? Very common for shaft seal leakers to spray out onto nearby objects. Is the clutch driver oily/greasy? My money is on the shaft seal- needs a new double lip style......

Gm Tech, no there is no sling. It's pretty darn clean under my hood. I'll check for that greasiness in a day or two. What is this new double lip style you speak of?

Boomer_106 on Wed May 06, 2009 10:07 PM User is offline

Quote
Originally posted by: Chick
See if you have any pressure left in the system. If you do, I agree with GM tech that the shaft seal is suspect, put a shower cap over it and check with your electronic leak detector after a half hour or so. I bet it goes nuts when you stick it under the shower cap.. Check out new and reman R4 compressors from Ackits.com. Or you can buy the tools and change the shaft seal yourself. There is a thread on the tips and FAQ forum showing how to do this along with part numbers etc.. Hope this helps..

Thanks Chick. I am awaiting a high side adapter from AMA so I'll check the pressure after I receive that part. I did read through that thread on changing the seal myself. Sounds like the way to go if I need to.

Boomer_106 on Tue May 12, 2009 5:05 PM User is offline

Ok, I received my adapter and have checked the pressures. The thread for this is here.

http://www.autoacforum.com/messageview.cfm?catid=2&threadid=20507&STARTPAGE=1

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