Re: Converting factory AC to use R134a
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Re: Converting factory AC to use R134a
Hey Jimbosprint, I just finished looking thru your photo gallery. Your truck is a close twin to mine except a couple of years newer. Good work with the pictures, I never thought to document everything like you did.
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Re: Converting factory AC to use R134a
Responding to thread topic (I did not read all the posts). Best I can tell, OP is converting from R12 to R134A. From the photos, it seems the original R12 condenser is being utilized. I also see a POA update tube has been installed. While this setup may work in milder northern or west coast environments, it won't work well when temps start to climb above about 90 degrees F. The R12 condenser just is not efficient enough at shedding the latent heat from the R134a refrigerant. An electric fan would help and should be considered a must. problem is, there is not enough space to fit a fan between the condenser and the hood latch support structure.
In my experience, the POA update kit is junk. You will feel it (air temp) every time the compressor cycles on/off which will be often. Good luck. |
Re: Converting factory AC to use R134a
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http://public.fotki.com/blazbk/blaze...er1.html#media |
Re: Converting factory AC to use R134a
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Re: Converting factory AC to use R134a
Tagging this so I can come back to it.
K |
Re: Converting factory AC to use R134a
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Re: Converting factory AC to use R134a
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Re: Converting factory AC to use R134a
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Originally Posted by jimbosprint View Post Old Air Products told me the condenser I got is the same one they sell with their aftermarket AC kits made for 134a. It seems to work above 90 degrees. Maybe it would work better with an electric fan. That is a piccolo condenser, same as the one that Classic Auto Air has sold. They more than likely get their condensers from the same manufacturer. I saw and responded to your post on fb also about that condenser. The piccolo condenser is better than the factory tube and fin type condenser but not seen as better performing than a true parallel flow cond. |
Re: Converting factory AC to use R134a
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Re: Converting factory AC to use R134a
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I have very little time running it, but it's been surprisingly good so far. I think the key is getting the POA valve set to 26.5psi and having a very clean and dry system. |
Re: Converting factory AC to use R134a
Those vent temps will rise in traffic or slower speeds with a factory condenser. They all do. Electric fans will help though.
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Re: Converting factory AC to use R134a
Any difference in quality between 4 seasons and AC Delco components? Price is almost double for Delco but most parts Ive received are made overseas these days.
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Re: Converting factory AC to use R134a
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Went with R-12 on my next truck with factory AC. It blows snowballs out the vents in 110 degree temps, sitting at a stand still in So Cal traffic. Yes it costs more than R 134 but so what? You charge it once either way and you are done. The bottom line is you want cold air and with R 12 you get it no matter what. What good is AC if it don't work?? No hoops to jump through and "hope" it works in the end with R 12. |
Re: Converting factory AC to use R134a
Is it possible to strip all of a R134 system from a newer vehicle to convert factory system over?
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That's way more work than necessary.
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Re: Converting factory AC to use R134a
I have a 1969 c20 and am curious as if I should replace my air conditioning system or not? I bought the truck and the compressor has not been hooked up in years. Everything is original.
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Re: Converting factory AC to use R134a
I vote for restoring an original system. If staying with r12, flush, pressure check both the evaporator and condenser. Test the poa valve to make sure It isn't stuck. Check the screen in the exp valve. You can clean it with some brake cleaner. Replace the drier. They are cheap. Some reuse their hoses/lines if they are in good shape. Hoses should not have cracks. Buy an aluminum a6 replacement compressor. Use mineral oil. If going with 134a, replace original condenser with parallel flow condenser. Recalibrate poa valve. Some will say to replace expansion valve but an original will work fine with 134a. I'd replace the hoses. Use pag oil. All this can be done for less than an aftermarket system plus it all bolts in and you get to keep the fresh air option.
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Re: Converting factory AC to use R134a
Awesome, thank you for the help. The system I am looking at is on a 1970 c20 and he's selling it for $350. It's all original parts. I just don't know if the parts that I have are still good. Not sure how to test them. I have all of the parts, only thing I don't have hooked up is the compressor and not sure if it's still any good.
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Re: Converting factory AC to use R134a
Since you say your system is complete on your 69 c20, then I wouldn't spend the money for another system. You can use that $350 towards new parts like the compressor, drier and hoses with a little more $added to it. You can look for a local old school ac shop or I can test the parts for you. You'd have to ship them though. I restore factory ac/heater parts.
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Did you guys update the evaporator or keep it original? I'm redoing the stock a.c. system on my 1969 c20.
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