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r12 to r134a conversion on a '93 Blazer???

This is a discussion on r12 to r134a conversion on a '93 Blazer??? within the Technical / Maintenance forums, part of the General Discussion category; Who has done this 134A conversion? Is it pretty simple? These retrofitting kits that Castro has makes it look pretty ...

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    Registered User Earth Havoc's Avatar
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    r12 to r134a conversion on a '93 Blazer???


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    Who has done this 134A conversion? Is it pretty simple? These retrofitting kits that Castro has makes it look pretty simple. I found a site that gives some info on the conversion for a Buick, I don't see that there is a difference since they both are GM. However, I've never done this conversion before.

    http://www.gnttype.org/techarea/airc...12toR134a.html

    Anyone have a site that has pictures and a write up on the conversion?
    Before Dishonor

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    Why convert ?
    That system wasnt designed for 134 it wont cool worth a sheet.
    Keep your system the way it is & use freeze 12.
    I have used it in a few trucks & it works better than 134.
    projects One Ton Jeep & 4x4 Crewcab 3500HD

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    :-) Mark's Avatar
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    Quote Originally Posted by j20m715
    Why convert ?
    That system wasnt designed for 134 it wont cool worth a sheet.
    Keep your system the way it is & use freeze 12.
    I have used it in a few trucks & it works better than 134.

    The reason they are doing the conversion is to save $. R12 is getting stupid expensive to get not to mention harder. Soon it will be obsolete and you will have to convert. So might as well do it now and get it over with. It's not expensive at all to convert it and you'll save $ in the long run. Yah it won't cool as good as it did before. But it still does pretty good. The conversion is really easy to do.

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    I do know r12 is expensive thats why I said freeze 12.
    Its cheap & works much better than 134.
    projects One Ton Jeep & 4x4 Crewcab 3500HD

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    Registered User 021500HD's Avatar
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    here is what I did on my 86 Monte Carlo SS; I replaced the compressor cause it was really noisey, if yours is good, no need to do that, next, I recovered the existing R12 and opened up the system, removed the orifice tube and the accumulator(it should be replaced, the dessicant is not compatible with R134a) and left all the lines disconnected and flushed it with Duraflush, the condensor and the evaporator. I blew it out with compressed air and started the reassembly with all new compatible O rings and installed the new orifice tube and accumulator and connected all the lines to the system, evacuated it and installed the correct amount of oil(8 ounces is what is called for now and I used GM oil) and recharged it with 90% of the R12 charge and am glad to report it works great and we have plenty of heat and humidity here to check the operation against. Hope this helps.

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    Registered User Earth Havoc's Avatar
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    Quote Originally Posted by j20m715
    I do know r12 is expensive thats why I said freeze 12.
    Its cheap & works much better than 134.
    I looked this up. Pretty cool!! No pun intended.

    Is there a write up on how to do this conversion? So all I need to do is just get the quick charge kit, throw the service fittings on, and charge my existing r12 system? Or is there something else? How many cans or how many oz. of Freeze 12 should I use for this Blazer? I know it says 90% of the r12, but I don't know how many oz. of r12 is in the Blazer.

    Thanks for this info.
    Before Dishonor

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    I do not know the quanity offhand for a blazer.
    You use it as you would r12.
    projects One Ton Jeep & 4x4 Crewcab 3500HD

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    Registered User jebx's Avatar
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    My biggest concern is that if you ever need professional repair done on your A/C system they most likely won't do it with Freeze12. They are required by law to have a dedicated recovery unit for just freeze 12. As far as I know, most places only deal in R12 and R134a (What the OEMs use).

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