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#1 |
Registered User
![]() Join Date: Jan 2007
Location: San Jose, California
Posts: 194
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Are the older 72 AC POA valves extinct?
I've been looking and looking to see if I can find a replacement for my original POA valve for my AC. It seems like nobody makes replacements. Please, does anybody know of anyone that makes new or rebuilds these? Or can these POA valves be repaired and re-used? If possible, I would like to keep my old system functioning like it did in 72.
I don't know why I'm reluctant to upgrade to a cycling system, but I am and I sure could use you guy's help if it's possible. Thanks, and I'm sorry if I'm being such a stic-in-da-mud on this. pic attached |
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#2 |
member #16
![]() Join Date: Dec 1999
Location: Yuba City Ca.
Posts: 3,618
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Re: Are the older 72 AC POA valves extinct?
They have them here when available. I would consider the upgrade kit if I want to keep the factory air.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#3 | |
Registered User
![]() Join Date: Jun 2006
Location: Tucson, Az
Posts: 705
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Re: Are the older 72 AC POA valves extinct?
Quote:
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#4 |
On the fast track to nowhere..
Join Date: May 2006
Location: Splendora, Texas
Posts: 5,316
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Re: Are the older 72 AC POA valves extinct?
Holy crap!
![]() Edit: Here's an NOS one for a car, looks the same to me. I bet if you called them they could tell you if it is. 6th POA from the top. http://thepartguy.com/ac-valvesALL.htm
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-Mike Owen- Norwood, Houston, Cecilia, Jackson, Monroe and counting Last edited by BACKYARD88; 08-13-2007 at 06:36 PM. |
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#5 |
Registered User
![]() Join Date: Jan 2007
Location: San Jose, California
Posts: 194
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Re: Are the older 72 AC POA valves extinct?
Whoa, yea! Maybe I'll just settle for a thermos of lemonade; although I'm tempted. I do have 3 cans of R12 left over from before the big tear in the ozone a few years ago so I think I'll use that till I run out. Also, I think I'll consider the kit Bodydrop recomended and live with the cycling.
Thanks for the help with the link guys |
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#6 |
Registered User
Join Date: Mar 2007
Location: Texas
Posts: 252
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Re: Are the older 72 AC POA valves extinct?
I know brotherstrucks makes one, but not sure on the price
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-Scott- 1970 C10 shortbed 396 1969 C30 dually flatbed "Vidalia" |
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#7 |
Senior Member
![]() Join Date: Oct 2005
Location: south carolina
Posts: 658
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Re: Are the older 72 AC POA valves extinct?
Just recently did the conversion on my truck to the r134a and updated poa. works pretty good but I have noticed that it doesn't seem to be cooling as good as I would like for it to. What does the cycling mean? is it supposed to cut the compressor on and off or what. Mine seems to be running all the time. I pulled a vac. down on it and everything is good. I also had a shop charge the system so its full of freon. Any body got any suggestions as what could be causing it to not cool as good as it should be? and I'm sorry for hyjacking your thread. Just thought that now would be a good time to ask this rather long question.
__________________
1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod. ![]() |
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#8 |
Registered User
Join Date: Sep 2006
Location: League City, Texas
Posts: 732
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Re: Are the older 72 AC POA valves extinct?
Cycling isn't necessarily a good thing. It is better if the compressor stays running on a properly working system. Cycling is usually caused by a low charge, freeze up, or it is just not that hot outside.
When does your truck not cool that well? Some times the problem may be the heater not turning off completely or a duct work problem. |
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#9 |
Registered User
![]() Join Date: Jan 2007
Location: San Jose, California
Posts: 194
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Re: Are the older 72 AC POA valves extinct?
Hey Rough,
No problem with your coments, they're great. My mechanic told me that R12 has a cooling performance advantage over the R134c freon around town when there's not alot of air flow, but on the freeway there's not much difference. I've heard that adding an electric AC fan in front of the radiator might help; might want to check that out. I remember comments in 73 when they switched-over to the cycling system on these AC units that they were going to wear out the compressors engaging and disengaging constantly at freeway speeds. I don't know, just talk I remember from back then... cursed my thinking about it, unfortunately, though I think now I'm heading that direction myself. Something else that I also need to re-check on my truck. There is a chamber in the heater box under the dash that has a large flapper gate moved by one of the heater/ac slider controls. If I remember, it deverted the airflow from the bottom vents to the front AC vents. I've had mine break before (cheap plastic axis attachment) and it left it stuck in whatever position it was when it broke. You might want to take that apart a little and peek inside to make sure it's working ok. Hope you get your system working soon |
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#10 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Are the older 72 AC POA valves extinct?
I have changed over to the later cycling system and it performs well. Yes the motor idleing the temp will rise, but when moving it will cool as good as anything else.
Things to consider when swaping over to 134-A system: get rid of the dryer and put the acumalator on it. Have it vacumed and charged by a A/C company. Buy a condensor for 134-A they are bigger tubes than a 30 year old condensor for R-12. 134-A has to expand more to be effective in it cooling. Here is a thread I did on my conersion. http://67-72chevytrucks.com/vboard/s...d.php?t=253275 Condensor: Evaperator & acumliator: Compressor and new hoses:
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#11 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Re: Are the older 72 AC POA valves extinct?
Lugnutt,
We run the POA valves in the four trucks that we have with AC and they work well. We test the POA valves before installation, adjusting if needed. I pick up POA valves in my local yard for use when I need one. The fitting locations need to be matched so to make sure of the interchange. Jim
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1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC |
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#12 | |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Are the older 72 AC POA valves extinct?
Quote:
And don't cycle your A6 compressor, it wasn't designed to do this. R134a, as others have pointed out, just doesn't work as good as R12. In my 1972 Chevelle, with a properly tuned POA system and R12, when I get out of my car to get the mail, my glasses fog up. I've NEVER had an R134a system do that. And if you're stuck in stop and go traffic with R134a, forget it. You need lots of air flow across the condenser to make it work right. I don't think the R134a condensers have larger tubes, I think they have LOTS of little tubes. Thus increasing the area the air can flow across. That is probably why folks who converted to 134a and didn't update the condenser don't have as good of performance. Remember, compared to a car, the area in a truck cab is small. 134a, while you're moving down the road will get the job done. One more little tid bit. I had the HVAC guy over the other day to resurrect my house AC. He is a car guy, and a Chevelle guy so we got to talking about cars and of course AC. I mentioned I might know where a sealed 30 pound tank of R12 is, whats it worth. He said that there are two new drop in replacements for R12 out there so the price just started to fall. To make a really long post short, if you're thinking of converting to R134a, you might want to sniff around for these two R12 replacements.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#13 |
Senior Member
![]() Join Date: Oct 2005
Location: south carolina
Posts: 658
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Re: Are the older 72 AC POA valves extinct?
So I should get rid of the dryer and use an accumulater and make sure that the condenser is for a 134a system. I had to order a new condenser and I told them it was for a 134a system but I think the one I got is still for r12. I also use a a6 compressor. Its not cycling or if it is its not noticeable.
__________________
1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod. ![]() |
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#14 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Are the older 72 AC POA valves extinct?
Mrein3,
Sorry you are correct the tubes are smaller but more of them, it was late and I didn't proof read it well 01:02 AM . My 134-a system does fine except for the sitting in traffic but once I get a electric fan mounted it should be fine. The other day it was 102 degree's here with high humidity and I was running 46-48 degree's in the truck going down the road.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#15 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,254
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Re: Are the older 72 AC POA valves extinct?
As long as we're on the subject, there is some good stuff here:
http://www.epa.gov/ozone/title6/609/.../retrguid.html Note that the SAE no longer believes you need to flush old R12 oil before filling with R134a and oil. If you're going to R134a in a stock system, don't forget to read this link: http://www.autoacforum.com/messagevi...AR_MSGDBTABLE=
__________________
'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#16 |
Too many projects!!!
Join Date: Jul 2000
Location: Jacksonville, Florida
Posts: 508
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Re: Are the older 72 AC POA valves extinct?
Lots of good info in this post..thanks
__________________
Sean ![]() 1995 Buick Roadmaster Sedan 2004 Chevy Trailblazer 5.3L V8 1963 Chevy Biscayne 4D Sedan 1971 Chevy C10 (now have 70 cab & frame) 1968 Chevy C10 (parts for the 70) 1991 Oldsmobile Custom Cruiser (Chevy 355 motor) 1937 Pontiac 8 4D Touring Sedan (in pieces) Jacksonville, Florida |
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#17 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Are the older 72 AC POA valves extinct?
You may want to check these guys out.
They say they will rebuild anypart out there for GM. http://www.classicair.com/GM-Factory.asp
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#18 |
Senior Member
![]() Join Date: Oct 2005
Location: south carolina
Posts: 658
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Re: Are the older 72 AC POA valves extinct?
I double checked my condenser and it does have more tubes than the stock condenser. So it appears to be for 134. Whats the difference between the accumulator and the drier.
__________________
1972 chevy cheyenne 10,nothing special at the moment,Its a work in progress, Working on the engine, paint and body,engine, paint and body,now its the suspenion, ahh hell I'm about tired of working on it. Maybe it will be a rat rod. ![]() |
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#19 |
Registered User
![]() Join Date: Nov 2006
Location: KINGSPORT,TN.
Posts: 3,035
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Re: Are the older 72 AC POA valves extinct?
Just Put Propane In For A R12 Subsitute And Will Cool Better Than R12. I Use It And Have For Years. But Your System Needs To Be In Good Condition..... No Leaks............
Bob
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I BELIEVE IN JOHN 3:16 |
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#20 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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Re: Are the older 72 AC POA valves extinct?
BCOWANWHEELS,
Are you not worried about the down side of using propane! One spark in the right place or should I say in the wrong place and BOOM! Nomore BCOWANWHEELS! That just sounds to scary for me.
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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