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#1 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Converting factory AC to use R134a
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#2 |
Senior Member
![]() Join Date: May 2003
Location: Sandown, NH
Posts: 2,819
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Re: Converting factory AC to use R134a
Thanks David, but I have a Sanden 508, you don't happen to know how much that would take ?
Thanks, Gary
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Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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#3 |
Registered User
Join Date: Jan 2011
Location: Townsend MT
Posts: 1,725
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Re: Converting factory AC to use R134a
I have had the same problem. A lot of out farm equipment has A6 compressors and I have found that the only reman A6 that will last is John Deere's. Everything else will fail within a year. John Deere's A6 (rebuilt right here in the states) will last.
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#4 | |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Converting factory AC to use R134a
Quote:
I'd buy a ![]() Forget the POA update as it converts your system to a cycling system designed for orifice tube use. You'd have to add a evaporator core to the above quote or fabricate an inline tube/filter. Other than the pricing being a little high, it should work. Oh, if using a parallel condenser I would not undercharge the system.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#5 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,528
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Re: Converting factory AC to use R134a
Anybody have a part number for a sized condenser that is built for 134a that will fit in the same mounting holes as the factory tube/fin condenser?
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#6 |
Vintage 4x4s
Join Date: Sep 2010
Location: Prior Lake, MN
Posts: 4,305
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Re: Converting factory AC to use R134a
subscribed
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades) 67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore ![]() 86 CHV K30 502 th400, apple red NEW 71 CHV K20 350 SM465, ochre (saved work truck) 71 CHV K20 292 SM465, white, tach, PTO, (future project) 72 CHV K20 350 350th, medium blue (project stocker) 01 CHV K2500hd crew, indigo blue ^3 dont run and the others don't see winter either '86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649 '71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642 '72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6 |
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#7 |
Registered User
Join Date: Apr 2007
Location: pasadena,TEXAS
Posts: 880
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Re: Converting factory AC to use R134a
sub'ed this is my next project
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1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#8 |
Registered User
Join Date: Mar 2022
Location: Avondale
Posts: 5
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Re: Converting factory AC to use R134a
I know this is a VERY old thread. Sorry and I am reviving only b/c I am not able to find information on wiring the hi-lo switch in a 70 C10 set up with factory air. I understand one wire goes to the compressor clutch but can't figure out the other wire. Does it go to the compressor switch behind the selector box in the cab?
Last edited by ricachon7; 04-26-2022 at 02:27 PM. |
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#9 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Converting factory AC to use R134a
I am definitely going back to R12. I looked over my new to me truck last night and the condenser is not original and much larger than stock. In fact, it is jammed under the hood latch plate and bent into a curve to fit. That ugly duckling is coming out. Now I am in the market for an R12 condenser if someone that converted to R134a has one lying around (and doesn't leak of course
![]() Also, to the person asking about Old Air recommendations, I am sure you cant go wrong if you follow their advice. Good luck. |
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#10 |
Active Member
![]() Join Date: Feb 2011
Location: Deep South Texas
Posts: 116
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Re: Converting factory AC to use R134a
Got my cross flow condenser from AMERICAN Radiator part #9011239. This one fits but of course you have to use the mounting hardware to install.
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#11 |
Registered User
Join Date: Apr 2007
Location: pasadena,TEXAS
Posts: 880
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Re: Converting factory AC to use R134a
where did you get your American radiator? and do you have a pic of it installed???? how do you like it I assume you went 134
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1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394 Last edited by hdff; 03-18-2015 at 08:06 PM. |
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#12 |
Senior Member
![]() ![]() Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,815
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Re: Converting factory AC to use R134a
Both my trucks are running 134a with all factory components, with the POA valve recalibrated.
The systems were flushed before the change over. Larry
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other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless. |
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#13 |
Active Member
![]() Join Date: Feb 2011
Location: Deep South Texas
Posts: 116
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Re: Converting factory AC to use R134a
I contacted American Radiator and gave them the measurements. My truck had stock ac,but when my compressor gave out I decided to update the system. Installed evaporator update kit, pro6ten compressor, orifice tube, drier and new cross flow condenser. Just haven't charged it yet. The only part I going to reuse are the hoses.
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#14 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,528
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Re: Converting factory AC to use R134a
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#15 |
Active Member
![]() Join Date: Feb 2011
Location: Deep South Texas
Posts: 116
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Re: Converting factory AC to use R134a
The measurements are 25x14. I measured it from the outside of the tanks not the core itself.
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#16 |
Registered User
Join Date: Apr 2007
Location: pasadena,TEXAS
Posts: 880
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Re: Converting factory AC to use R134a
Www.Americanradiator.us Is this where you got it?
__________________
1971 Cheyenne SWB 402BB, 700R4, 3.73 posi, PS, PB, A/C, Tilt, Tach "Wanda" Don't argue with idiots, People watching may not be able to tell the difference... There's someone in my head........But it's not me...... cheap tricks thread great info here!! http://67-72chevytrucks.com/vboard/s...d.php?t=489394 |
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#17 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Converting factory AC to use R134a
I think you'd be safe with 7-8 ounces. Make sure you're using new barrier hoses as the 134a and PAG will slowly ruin the older style hose.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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#18 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Converting factory AC to use R134a
My information says a Sanden 508 needs 5.5-6 ounces of PAG 100 oil.
What I have read is that the mineral oil used in R12 systems impregnates the rubber (hoses) and thus prevents the R134a molecules from leaking through (thus barrier hoses not required). I have not heard that PAG oil attacks the rubber hoses. With all that said, you cannot go wrong in replacing or having the hoses rebuilt with barrier hoses. |
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#19 |
Senior Member
![]() Join Date: May 2003
Location: Sandown, NH
Posts: 2,819
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Re: Converting factory AC to use R134a
Thanks David !!!
The hoses will all be new, and correct for R134A... Gary
__________________
Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859 |
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#20 |
Registered User
Join Date: Jul 2014
Location: Chico, California
Posts: 941
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Re: Converting factory AC to use R134a
My Old Air Products order arrived today. New compressor, condenser (not pictured), drier, POA update, and tubes/hoses. Now I just need some time to work on it.
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#21 |
Its a Truck Thing......
Join Date: Dec 2004
Location: Sierra Vista, Arizona
Posts: 3,159
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Re: Converting factory AC to use R134a
I converted mine to 134 and here are the part numbers in the write up. I got a Sanden compressor for the Serp Set Up and had an Orfice Tube ran, new lines made, put a pusher fan on the old condensor and wired it into the electric fan circuit relay. Been running it for over three years with no problems. Everthing inside is the same, everything outside is a little modified...Gets to about 40 degrees in the cab. Used it in NC with ridiculous humidity and high 90's.
http://67-72chevytrucks.com/vboard/s...d.php?t=468729 Smitty
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71 C10 283/3SPD Full Resto 71 GMC 1500 Sierra Grande http://67-72chevytrucks.com/vboard/s...d.php?t=518599 70 C10 Suburban Former military GSA truck. 72 Chevy Blazer 4X4, Sloppy Jo, Mountain Climber. Wife says no more trucks. http://67-72chevytrucks.com/vboard/s...d.php?t=707378 72 GMC 1 Ton Motor Home, wife said no more trucks until she saw this one. Gen 3 6.0/4L80E 4.10 http://67-72chevytrucks.com/vboard/s...d.php?t=761110 68 GMC Suburban was 3/4 ton, now 1/2.Wife shook her head 71 C30 Wrecker 71 C20 Scott-Bilt As weird as it gets..BB Cheyenne AC Truck 68 GMC Long Stepside. They keep following me home 71 C20 Longhorn/Ole Yellor 69 C30 Former Motor Home, Flat Bed time |
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#22 |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Converting factory AC to use R134a
FWIW, POA update,is a POS in my oppinion. Stay with the genuine POA AND ADJUSTMTO 26 psi. Test rig is easy to fabricate. I tested my original POA and is fine. Calibrated to 29.5 psi for R-12. Next chance imget, the POA update is coming out in favor of the POA.
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#23 |
Registered User
Join Date: Jun 2013
Location: Waterloo IL
Posts: 49
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Re: Converting factory AC to use R134a
I did the 134 POA adjustment to 26 PSI on my 70 Chevelle and installed a brand new GM compressor along with drier, seals, and hoses (not a reman) and it worked great the entire time I was running it. Prior to that I had the tube. It constantly cycled and cooling would instantly stop when it kicked off. I would avoid the tube if possible. Just my experience.
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#24 | |
Registered User
Join Date: Nov 2014
Location: Austin
Posts: 749
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Re: Converting factory AC to use R134a
Quote:
BTW, sorry about the terrible previous post by me...did it on my phone. |
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#25 |
Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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Re: Converting factory AC to use R134a
Hello !! I have a 72 C20 that I am going to install a serpentine set-up from a 95 chevy pickup.
I understand that I need to change out the receiver/dryer. I bought the cycling P O A valve for 134 http://www.classicparts.com/1967-72-.../#.VW5tfGfbJLM Can I run the same compressor that was on the 95 chevy in my 72 with 134 ? I will have to get hoses made to fit the newer compressor if I can run that compressor. Thank you in advance for any and all help and advice !!! Tom |
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Tags |
134a, a/c, air conditioning, r134, r134a |
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