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1989 Corvette R12 and Mineral oil Questions

89vette on Tue May 03, 2011 1:36 PM User is offline

Year: 1989
Make: Chevrolet
Model: Corvette
Engine Size: 350
Refrigerant Type: R12
Ambient Temp: 90
Country of Origin: United States

OK I am new to this forum and I have some questions. I have an 89 Corvette and the AC evaporator failed (I broke the tube during header installation). I have a new Evaporator and see I can get R12 on EBAY if I get an EPA license. My mechanic says he has the equipment for a re-charge. I found a chart on this forum that states my system takes 44 OZ of R12 and 8oz of mineral oil. After the system is vacuumed out, how do you know how much oil is left in the system and how much to add?

Is there anything else I need to know? Since the system is empty, could I use Freeze 12 instead or do I need to change hoses an orings?


Cussboy on Tue May 03, 2011 2:47 PM User is offline

Use R-12. I'd add back at least a few ounces of refrigeration oil, if you broke something the refrigerant proabably came out forcefully, taking some oil with it.

Did you actually break the evaporator or was it the condenser?

89vette on Tue May 03, 2011 3:30 PM User is offline

It was the evaporator. I have had the compressor unbolted and moved out of the way many times over the years and each time I guess it moved the tube a little until it finally gave way. I'll buy some R12 and oil to get her working again. Thanks for the reply.

Cussboy on Tue May 03, 2011 9:10 PM User is offline

Install a brand-new receiver-drier unit too.

89vette on Wed May 04, 2011 9:15 AM User is offline

OK I ordered a new receiver and a stock orifice. Where the heck do I get new O-Rings? I can't find them anywhere.

89vette on Wed May 04, 2011 9:16 AM User is offline

Will this work??

Cussboy on Wed May 04, 2011 9:34 AM User is offline should be able to supply the O-rings, that kit will likely cover it, call them to ask. Also parts stores like NAPA or CarQuest.

Last year when I replaced the AC compressor and accumulator in my 1994 Suburban, one of the O-rings that came in the accumulator box was thinner than the one that had been on the vehicle. So I took the used O-ring to CarQuest, where they matched it by size from parts drawers; I paid my 25 cents and finished the task.

Edited: Wed May 04, 2011 at 9:35 AM by Cussboy

89vette on Wed May 04, 2011 9:47 AM User is offline

Got it. Thanks for the help.

89vette on Fri June 24, 2011 2:22 PM User is offline

Got the R12 on Ebay, picked up a new Dryer and Evaporator and O-Rings. Local shop charged me $31.80 to vac the system, add oil and charge. I've owned this car for 15 years and it never blew this cold! Thanks everyone.

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