1966 Oldsmobile A/C

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Mikel
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Joined: Mon Aug 06, 2018 1:45 pm

1966 Oldsmobile A/C

Postby Mikel » Fri Mar 06, 2020 5:04 pm

Hello,
I'm in the process of reviving the A/C in my 1966 Toronado.

I rebuilt the A6 compressor, I'm having all hoses rebuilt and will be flushing the evaporator and condenser. What gas do you recommend? R134A, R152A? Propane/Isobutane? I have never dealt with a system with a POA. I plan on rigging mine with compressed air and testing its operation. Any suggestions?

Thank you.
Dougflas
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Re: 1966 Oldsmobile A/C

Postby Dougflas » Sat Mar 07, 2020 6:59 am

Keep it R12
Mikel
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Re: 1966 Oldsmobile A/C

Postby Mikel » Sat Mar 07, 2020 7:23 am

Dougflas wrote:Keep it R12


That would be ideal, but I am concerned about long term availability of R12.
Thanks.
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JohnHere
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Location: South Carolina Upstate - USA

Re: 1966 Oldsmobile A/C

Postby JohnHere » Sat Mar 07, 2020 9:14 pm

I advise staying far away from the highly flammable refrigerants you mention: R-152a, propane, and isobutane. They're very dangerous to work with, present a fire hazard should the system leak, and they're just not worth the risk, in my opinion.

As already suggested, R-12 would be best because your system was originally designed for it.

R-134a will also work, is much less costly, and readily available for the foreseeable future. But it will have a slight penalty in cooling efficiency in your application.

If you decide to go with the latter, be sure the desiccant in the receiver/dryer you install is compatible with R-134a, that you evacuate the system well (several hours and even overnight), use the correct amount and type of oil (PAG-46 or PAG-100), and charge it to about 80-percent of the R-12 amount.
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Cusser
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Re: 1966 Oldsmobile A/C

Postby Cusser » Sun Mar 08, 2020 6:28 am

Mikel wrote:
Dougflas wrote:Keep it R12


That would be ideal, but I am concerned about long term availability of R12.
Thanks.


If you're in USA, there's a glut of R-12, as there are few actual uses for it. It's legal to use. Most of the R-12 vehicles are either off the road or those are amenable to conversions have been switched to R134a. Yes, I understand that R-12 is still relatively expensive, and that one "should" have a 609 certificate to purchase it, just make sure your system has no leaks, refrigerant is not a consumable should last indefinitely unless it leaks out.

I still use R-12 in my 1988 truck.
Dougflas
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Re: 1966 Oldsmobile A/C

Postby Dougflas » Sun Mar 08, 2020 10:11 am

If you think R12 is expensive, wait until you price R1234YF. R1234YF is being used on a lot of new vehicles.
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Cusser
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Re: 1966 Oldsmobile A/C

Postby Cusser » Sun Mar 08, 2020 9:08 pm

Dougflas wrote:If you think R12 is expensive, wait until you price R1234YF. R1234YF is being used on a lot of new vehicles.


Yet another "not better" better idea.

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