#21  
Old 05-11-2017, 11:09 PM
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Why would you spend money making a system R-12 when it is gone. Theres a reason why tons of it is at swap meets.

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  #22  
Old 05-12-2017, 12:39 AM
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If you have to sit in traffic with the a/c on - R12 hands down.
If your driving will be mostly highway, much less difference.

  #23  
Old 05-12-2017, 12:41 PM
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Toyota made only three change when switching from r-12 too 134.
Changed refrigerant oil and the junction O-rings. Added more window tint to reduce heat load.

The major components remained the same.

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  #24  
Old 05-12-2017, 01:00 PM
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R-12 works better in the old systems. Hands down. Whatever you decide on make sure you use the proper oil. The two are not compatible.

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Old 05-12-2017, 03:39 PM
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The phasing out is due to the patent running out. It's all about it he almighty dollar!
I have used 134a in my 71 and 78 T/A' s with no adverse affects for over 10 years. Yes, with 134a the condensers have more fins per inch and they do run at a higher head pressure. You're final vent temp should be about the same, but the R134a undoubtedly takes longer to get to temp. That's the real down side. In both these cars I run not only the factory but the original condensers, which are terrible when it comes to efficiency compared to a modern aluminum one. They just transfer the heat as good. As a matter of fact it's unfair to even compare the two. If I made that change it would be better yet. But in my 71 Fbody which we all know Fbodyshave the worst duct systems of just about any car produced in the modern world gives me 38 to 40 degrees at the center vent on the hottest So. Florida day idling using a thermostatic fan clutch and regular fan. On the highway you can't set it low enough.

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  #26  
Old 05-28-2017, 02:58 PM
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R 12 is the best freon in the old cars to use. The system was designed for R12. When converting to 134a, people don't realise you need a bigger evaporator, and condenser to make it work efficiently. 134 will never give you what R12 does. Low cooling evap temps, Unless your car was Designed for 134a. As long as you don't have a leak fill it with R12. Simple to check before you ever add freon let the system sit their for and hour under a vacuum, If it holds vacuum you know the system is tight. I have r12 cans .some

  #27  
Old 05-28-2017, 04:53 PM
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I miss R-12.
My 78 was converted to 134. It will keep you from dying on a hot NC day, but that's about it. Still better than nothing.
R-12 if you can swing it!

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  #28  
Old 05-29-2017, 10:23 PM
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R12 flat out works better in these older cars.

The additional cost of tracking down R12 cans is minimal. How often are you servicing your A/C for it to be a big deal? Spending a little more per can shouldn't bankrupt you.

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  #29  
Old 05-30-2017, 10:36 PM
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r12 is the best and its not hard to get. OEM last installed it in 1993-94? its still around, as r134 will be here for a long time. The new r1234yf is $700 for 10 lbs. For now the wrecked cars in body shops (your insurance company) is paying for it and rates will go up to cover it.
Be sure to use new hoses, as they are much better at sealing the system. Do not install the accumulator until you are ready to put the system under a vacuum. If they use a Micron Gauge, it should be easy to tell if there is any leak. Sometimes the compressor shaft seal can leak under a vacuum, but will seal under pressure. I would for sure get someone that knows what they are doing, it's easy to get air mixed in with the refigerent if little cans are used. Be sure to try to get all air flow to be pulled through the condenser, seal off any gaps so there is no air leakage between the condenser and the radiator. Be sure your clutch fan is good and operational.

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  #30  
Old 05-16-2022, 08:33 AM
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A lot of bad advice and incorrect information in this thread.

  #31  
Old 05-16-2022, 09:44 AM
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I stick with R12, works great, I picked up a 25 lb tank, and the 2 machines, I have my own personal hole in the ozone layer. If your ever at the North Pole, it’s the hole above John’s cabin 🤣

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  #32  
Old 05-16-2022, 10:10 AM
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Quote:
Originally Posted by Trevor78 View Post
A lot of bad advice and incorrect information in this thread.
Care to share what you believe is bad advice or incorrect info?

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  #33  
Old 05-16-2022, 01:50 PM
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Quote:
Originally Posted by Trevor78 View Post
A lot of bad advice and incorrect information in this thread.
Well, come on, then. Don't be shy. What wisdom do you have to share on this?

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  #34  
Old 06-06-2022, 11:09 AM
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I have to admit I have not been in an older vehicle that had R12 but I did put 134 in my 79 Trans Am, works good. I dont know if R12 would keep car any cooler but I do know that whatever refrigerant you use it will not increase blower motor speed. In my opinion that is the real problem with older vehicles. The blower motors need to push out more cold air then they do. When I use my AC in TA on hot days the fan is on high always and that barely rates maybe a 2 or 3 on my more modern vehicles.

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  #35  
Old 06-06-2022, 12:48 PM
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The vent temps in both of my old Pontiacs with R12 is 36-38 degrees F. The biggest issue with 134 in the old stuff is the condenser design, and getting all of the old oil out before putting the 134 in. If you swap condensers, then the cooling should be comparable.

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