Another AC Question... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

67CHIP72 · 04-03-2008, 08:06 AM

I know there have been a thousand threads like this, but it is hard to decipher from the lot. I have complete R12 OEM AC system in my truck that has not been used for around 5 years. What will I need to buy to get it working with r134, provided all original equipment is functioning?

Willys47 · 04-03-2008, 08:20 AM

134a rerfrigerant ueses a poe oil R12 is a mineral oil so the oil will need to be changed if the system is leak free it may not be with 134a because the 134a molecule is 12 times smaller,but if the system will hold a 500 micron vacume it will prove the system to be leak free.

stope4 · 04-04-2008, 02:58 AM

you need to change the oil, dryer, orings and adjust your POA to read 26 psi.

mrein3 · 04-04-2008, 05:43 AM

I wish I got paid for posting this link...
http://www.autoacforum.com/messagevi...&threadid=7567
You don't need a fancy POA eliminator, your A6 compressor wasn't made for that.
I read some where that you don't have to worry about flushing the old oil however I would attempt to get most of it out before filling with the correct oil.
You should replace all o-rings now with R134a compatible o-rings.
You must replace the receiver/dryer (black can in front of core support).
Pull a vacuum. (This boils the water out of the system)
Fill with R134a.

67CHIP72 · 04-04-2008, 07:10 AM

Thank you.

**El Jay** · 04-04-2008, 09:50 AM

Quote:

Originally Posted by 67CHIP72

I know there have been a thousand threads like this, but it is hard to decipher from the lot. I have complete R12 OEM AC system in my truck that has not been used for around 5 years. What will I need to buy to get it working with r134, provided all original equipment is functioning?

I have, on a shelf, in my garage, 2 cases of 12ea.-12 oz cans of R-12.
I would be willing to part with all, or part, of one case.
I have no idea in the world what they'd be worth, if anything, nowadays.

**El Jay** · 04-04-2008, 10:15 AM

Sorry, Gang.
I messed up.
I wasn't trying to steal the thread.

I tossed that out there for 67chip72.

I should have been more specific.

El Jay

67CHIP72 · 04-04-2008, 06:34 PM

Thanks El Jay, but I think I would only be prolonging the inevitable(R134a conversion). I have not had this system working since I've owned the truck, so I imagine I'm going to have to rplace some parts anyway. Thanks for the heads up though. I'm sure someone here would love to take it off your hands. Have a good one.

04-03-2008, 08:06 AM	#1
67CHIP72 STOLEN Join Date: Jun 2006 Location: Orange County Posts: 1,022	Another AC Question... I know there have been a thousand threads like this, but it is hard to decipher from the lot. I have complete R12 OEM AC system in my truck that has not been used for around 5 years. What will I need to buy to get it working with r134, provided all original equipment is functioning? __________________ In Search Of Last edited by 67CHIP72; 04-03-2008 at 08:07 AM.

04-03-2008, 08:20 AM	#2
Willys47 Registered User Join Date: Dec 2007 Location: Nanaimo B.C. Posts: 604	Re: Another AC Question... 134a rerfrigerant ueses a poe oil R12 is a mineral oil so the oil will need to be changed if the system is leak free it may not be with 134a because the 134a molecule is 12 times smaller,but if the system will hold a 500 micron vacume it will prove the system to be leak free. __________________ I was hooked on these trucks since 1982 when I drove my budys fathers 1968 Custum GMC 396 automatic dana 60 rear with a power lock diff what a ride more fun then we will we can ever tell!! Last edited by Willys47; 04-03-2008 at 08:22 AM.

04-04-2008, 02:58 AM	#3
stope4 Registered User Join Date: Jan 2006 Location: Houston Posts: 434	Re: Another AC Question... you need to change the oil, dryer, orings and adjust your POA to read 26 psi. Last edited by stope4; 04-04-2008 at 02:58 AM.

04-04-2008, 05:43 AM	#4
mrein3 Registered User Join Date: Feb 2000 Location: Center City, MN, USA Posts: 3,254	Re: Another AC Question... I wish I got paid for posting this link... http://www.autoacforum.com/messagevi...&threadid=7567 You don't need a fancy POA eliminator, your A6 compressor wasn't made for that. I read some where that you don't have to worry about flushing the old oil however I would attempt to get most of it out before filling with the correct oil. You should replace all o-rings now with R134a compatible o-rings. You must replace the receiver/dryer (black can in front of core support). Pull a vacuum. (This boils the water out of the system) Fill with R134a. __________________ '70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN

04-04-2008, 07:10 AM	#5
67CHIP72 STOLEN Join Date: Jun 2006 Location: Orange County Posts: 1,022	Re: Another AC Question... Thank you. __________________ In Search Of

04-04-2008, 10:15 AM	#7
El Jay Gone to greener pastures Join Date: May 2007 Location: Gateway to the Delta Posts: 7,354	Re: Another AC Question... Sorry, Gang. I messed up. I wasn't trying to steal the thread. I tossed that out there for 67chip72. I should have been more specific. El Jay __________________ '69 Chevy 1/2 T LWB Stepper: Daily Beater '72 GMC 3/4 T Fleet: Another Daily Beater '72 Plymouth Gran Coupe: ? "Ah women. They make the highs higher and the lows more frequent." Friedrich Nietzsche "Never kick a fresh turd on a hot day." Harry S. Truman GUN CONTROL: Never having to say, "I missed you." Always fire two warning shots into your attacker's chest area before putting a bullet between his eyes. Paraphrased from Louis Awerbuck Last edited by El Jay; 04-04-2008 at 10:20 AM. Reason: spelling

04-04-2008, 06:34 PM	#8
67CHIP72 STOLEN Join Date: Jun 2006 Location: Orange County Posts: 1,022	Re: Another AC Question... Thanks El Jay, but I think I would only be prolonging the inevitable(R134a conversion). I have not had this system working since I've owned the truck, so I imagine I'm going to have to rplace some parts anyway. Thanks for the heads up though. I'm sure someone here would love to take it off your hands. Have a good one. __________________ In Search Of



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