Converting factory AC to use R134a - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Davidf · 03-20-2015, 11:12 AM

Quote:

Originally Posted by CUSTOM/10

How much oil should be put into the system once it has been flushed of the old oil ?

Gary

A6 compressor needs 10-11 ounces of PAG 150 (R134a) oil.

**CUSTOM/10** · 03-20-2015, 11:49 AM

Thanks David, but I have a Sanden 508, you don't happen to know how much that would take ?

Thanks, Gary

1972RedNeck · 03-19-2015, 09:05 PM

Quote:

Originally Posted by leddzepp

134 will leak out of the front seal on a rebuilt stock (A6) compressor eventually.

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.

Bigdav160 · 03-17-2015, 04:50 PM

Quote:

Parts list:
Condenser- 11-7201 $205.00
Drier- 21-4215A $65.00
Compressor- 21-2201SH $345.00
POA Update- 50-2551A $95.00
Hose Set- 95-7215A $110.00
Liquid Line- 95-7216 $24.00
Tube Set- 50-7220 $48.00

I would change a couple things.

I'd buy a

Sanden A-6 replacement
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.

**kwmech** · 03-17-2015, 08:13 PM

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?

Vintage Windmills · 03-17-2015, 09:15 PM

subscribed

hdff · 03-17-2015, 10:00 PM

sub'ed this is my next project

ricachon7 · 04-26-2022, 02:05 PM

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?

Davidf · 03-18-2015, 01:28 PM

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.

**coppertone** · 03-18-2015, 04:21 PM

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.

hdff · 03-18-2015, 07:45 PM

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

**davischevy** · 03-18-2015, 09:52 PM

Both my trucks are running 134a with all factory components, with the POA valve recalibrated.

The systems were flushed before the change over.

Larry

**coppertone** · 03-18-2015, 10:59 PM

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.

**kwmech** · 03-19-2015, 12:49 AM

Quote:

Originally Posted by coppertone

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.

Do you happen to have the measurements on the core size?

**coppertone** · 03-19-2015, 07:33 PM

The measurements are 25x14. I measured it from the outside of the tanks not the core itself.

hdff · 03-19-2015, 09:06 PM

Www.Americanradiator.us Is this where you got it?

Bigdav160 · 03-20-2015, 12:01 PM

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.

Davidf · 03-20-2015, 12:24 PM

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.

**CUSTOM/10** · 03-20-2015, 12:30 PM

Thanks David !!!

The hoses will all be new, and correct for R134A...

Gary

jimbosprint · 06-02-2015, 04:09 PM

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.

71meangreenc10 · 06-02-2015, 05:14 PM

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

Davidf · 06-02-2015, 07:39 PM

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.

ss454conv · 06-02-2015, 10:19 PM

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.

Davidf · 06-03-2015, 02:10 PM

Quote:

Originally Posted by ss454conv

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.

Yep, I have the same experience with the POA update/tube. It is terrible and definitely NOT something anyone should install. Don't waste your money. If you don't have a POA, they are available on Ebay. If yours doesn't work, it can be rebuilt (again check Ebay) or get a used replacement. I am just ticked that I wasted so much R12.

BTW, sorry about the terrible previous post by me...did it on my phone.

72 K20 · 06-02-2015, 11:03 PM

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

03-20-2015, 11:49 AM	#2
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,797	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 __________________ Gary 72 SWB 4x4 My 72 SWB Build http://67-72chevytrucks.com/vboard/s...d.php?t=259859

03-17-2015, 08:13 PM	#5
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,402	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?

03-17-2015, 09:15 PM	#6
Vintage Windmills Vintage 4x4s Join Date: Sep 2010 Location: Prior Lake, MN Posts: 4,305	Re: Converting factory AC to use R134a subscribed __________________ 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

03-17-2015, 10:00 PM	#7
hdff Registered User Join Date: Apr 2007 Location: pasadena,TEXAS Posts: 880	Re: Converting factory AC to use R134a sub'ed this is my next project __________________ 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

04-26-2022, 02:05 PM	#8
ricachon7 Registered User Join Date: Mar 2022 Location: Avondale Posts: 5	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.

03-18-2015, 01:28 PM	#9
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	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.

03-18-2015, 04:21 PM	#10
coppertone Active Member Join Date: Feb 2011 Location: Deep South Texas Posts: 116	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.

03-18-2015, 07:45 PM	#11
hdff Registered User Join Date: Apr 2007 Location: pasadena,TEXAS Posts: 880	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 __________________ 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.

03-18-2015, 09:52 PM	#12
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,789	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 __________________ 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.

03-18-2015, 10:59 PM	#13
coppertone Active Member Join Date: Feb 2011 Location: Deep South Texas Posts: 116	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.

03-19-2015, 07:33 PM	#15
coppertone Active Member Join Date: Feb 2011 Location: Deep South Texas Posts: 116	Re: Converting factory AC to use R134a The measurements are 25x14. I measured it from the outside of the tanks not the core itself.

03-19-2015, 09:06 PM	#16
hdff Registered User Join Date: Apr 2007 Location: pasadena,TEXAS Posts: 880	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

03-20-2015, 12:01 PM	#17
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	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. __________________ 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

03-20-2015, 12:24 PM	#18
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	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.

03-20-2015, 12:30 PM	#19
CUSTOM/10 Senior Member Join Date: May 2003 Location: Sandown, NH Posts: 2,797	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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06-02-2015, 04:09 PM	#20
jimbosprint Registered User Join Date: Jul 2014 Location: Chico, California Posts: 940	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. __________________ '72 Chevrolet C20 Deluxe \| '72 Chevrolet K10 Cheyenne www.jimbosprint.com

06-02-2015, 05:14 PM	#21
71meangreenc10 Its a Truck Thing...... Join Date: Dec 2004 Location: Sierra Vista, Arizona Posts: 3,159	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 __________________ 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

06-02-2015, 07:39 PM	#22
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	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.

06-02-2015, 10:19 PM	#23
ss454conv Registered User Join Date: Jun 2013 Location: Waterloo IL Posts: 49	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.

06-02-2015, 11:03 PM	#25
72 K20 Registered User Join Date: Mar 2011 Location: Brandon,Iowa Posts: 391	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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