1982 gmc AC r12 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Mr. Potato head · 07-08-2010, 07:17 PM

Hi i have a 1982 gmc and need the ac to work , i search the forums search tab no items ,, My question how to convert to the 134a oil from the r12 , i did some googeling , . Somone here must have done it , thankyou

77gmcjoe · 07-08-2010, 07:54 PM

I took my '77 to a garage that I trust and had them do it. I figured it was safer to let a professional do that.

Skratch · 07-08-2010, 08:26 PM

This is in a nut shell . . . every line has to be broken loose and cleaned internally with the proper cleaning products, every o-ring has to be replaced, once the system is reassembled the accumulator has to be replaced as does the orifice tube and new adapters added to the high and low side ports, then the new oil (normally Esther oil in a R12 to r134a conversion) is added to the system (some to the compressor itself and some to the high side), the system is vacuumed down to remove all air and moisture, the new refrigerant in now added . . .

Unless you have experience doing this work and the proper tools to pull the vacuum, then I really recommend having a qualified shop do the work, even if they let you supply the parts.

I did all the work to mine, cleaning, o-rings, new oil . . . then let Sears pull the vacuum and recharge . . . they destroyed my system because they didn't pull any vacuum and added even more oil then overcharged . . . don't take your truck to Sears, those guys are friggen idiots!

Yes you can do it at home, yes some people do it without pulling a vacuum, in the end the system lasts a much shorter time.
If you want it to last and work well, find a good shop and talk to them about options to keep costs down like supplying your own parts.

Jeepwm69 · 07-12-2010, 01:28 PM

You can get a vacuum pump on autozones loaner tool program to pull a vacuum on your system. FYI

Skratch · 07-12-2010, 01:39 PM

Dang it, I rent tools from there all the time and I didn't know about that . . . well I guess there is next time then.
Thanks for the heads up.

kelsfine69 · 07-12-2010, 05:07 PM

My R-12 all leaked out so i bought 3 cans of Dura-Cool and put it in after I fixed all the leaks. Works very well I must say for a DIY

Mr. Potato head · 07-12-2010, 06:22 PM

Thanks , i read some on google about welfare fix with propane lol , boom ill look into the Dura-Cool thing .

07-08-2010, 07:17 PM	#1
Mr. Potato head Registered User Join Date: Sep 2009 Location: Shelton Wa. Posts: 2	1982 gmc AC r12 Hi i have a 1982 gmc and need the ac to work , i search the forums search tab no items ,, My question how to convert to the 134a oil from the r12 , i did some googeling , . Somone here must have done it , thankyou

07-08-2010, 07:54 PM	#2
77gmcjoe What do we get for $10? Join Date: Oct 2004 Location: Beardstown, Illinois Posts: 341	Re: 1982 gmc AC r12 I took my '77 to a garage that I trust and had them do it. I figured it was safer to let a professional do that. __________________ 1977 GMC K25 400/400/205 1989 Chevy Suburban R1500 350/700R4 (work beater) 1994 Chevy K3500 dually 454/4L80 1996 Corvette LT4 350/ZF 6 speed 2000 Bonneville SSEI Supercharged 3.8 Liter V6 1966 Chevelle 2 door sedan (Needs major repair )

07-08-2010, 08:26 PM	#3
Skratch Registered User Join Date: May 2010 Location: Groveport, OH Posts: 35	Re: 1982 gmc AC r12 This is in a nut shell . . . every line has to be broken loose and cleaned internally with the proper cleaning products, every o-ring has to be replaced, once the system is reassembled the accumulator has to be replaced as does the orifice tube and new adapters added to the high and low side ports, then the new oil (normally Esther oil in a R12 to r134a conversion) is added to the system (some to the compressor itself and some to the high side), the system is vacuumed down to remove all air and moisture, the new refrigerant in now added . . . Unless you have experience doing this work and the proper tools to pull the vacuum, then I really recommend having a qualified shop do the work, even if they let you supply the parts. I did all the work to mine, cleaning, o-rings, new oil . . . then let Sears pull the vacuum and recharge . . . they destroyed my system because they didn't pull any vacuum and added even more oil then overcharged . . . don't take your truck to Sears, those guys are friggen idiots! Yes you can do it at home, yes some people do it without pulling a vacuum, in the end the system lasts a much shorter time. If you want it to last and work well, find a good shop and talk to them about options to keep costs down like supplying your own parts. __________________ If it ain't broke, then I haven't fixed it yet! '86 Fiero SE 2M6 (undergoing a Northstar swap) '87 1/2t 4wd Suburban (4" lift with built 1t axles and beadlocks) '90 3/4t 2wd Suburban (Tow Rig) '94 3/4t 4wd G20 Van (Toasted tranny and rusted) '96 Deville Last edited by Skratch; 07-08-2010 at 08:29 PM.

07-12-2010, 01:28 PM	#4
Jeepwm69 Registered User Join Date: Jan 2009 Location: Arkansas Posts: 679	Re: 1982 gmc AC r12 You can get a vacuum pump on autozones loaner tool program to pull a vacuum on your system. FYI

07-12-2010, 01:39 PM	#5
Skratch Registered User Join Date: May 2010 Location: Groveport, OH Posts: 35	Re: 1982 gmc AC r12 Dang it, I rent tools from there all the time and I didn't know about that . . . well I guess there is next time then. Thanks for the heads up. __________________ If it ain't broke, then I haven't fixed it yet! '86 Fiero SE 2M6 (undergoing a Northstar swap) '87 1/2t 4wd Suburban (4" lift with built 1t axles and beadlocks) '90 3/4t 2wd Suburban (Tow Rig) '94 3/4t 4wd G20 Van (Toasted tranny and rusted) '96 Deville

07-12-2010, 05:07 PM	#6
kelsfine69 18 Till I Die Join Date: Mar 2005 Location: Alberta, Canada Posts: 1,522	Re: 1982 gmc AC r12 My R-12 all leaked out so i bought 3 cans of Dura-Cool and put it in after I fixed all the leaks. Works very well I must say for a DIY __________________ 2011 GMC Acadia 1969 GMC BBC LS7 2007 GMC Crew Duramax 1987 Camaro Iroc 350 Tuned Port Injection 42000Km 1987 Chevrolet Silverado 350 TBI 1987 Chevrolet Silverado 350 TBI(yes 2) Take me drunk, I'm too home...

07-12-2010, 06:22 PM	#7
Mr. Potato head Registered User Join Date: Sep 2009 Location: Shelton Wa. Posts: 2	Re: 1982 gmc AC r12 Thanks , i read some on google about welfare fix with propane lol , boom ill look into the Dura-Cool thing .



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