How To Retrofit an AC System R-12 to R-134a -EricTheCarGuy

Retrofitting AC systems is something that has been done for many years now. In 1996 systems were switched over to R134a from R12 refrigerant. R12 refrigerant is no longer available to the general public so when faced with a major AC repair on on older vehicle like my Acura Vigor, it's a good idea to retrofit the system to work with R134a. There are some important considerations however such as what to do with the old oil in the system. Be sure to consult with the service information for your vehicle for the most accurate information on that.

Camera: Brian Kast

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[drink]

So i found a broken bathroom window and a schrader valve in my sink....

[ericthecarguy]

Something to be considered when servicing an AC system older than 1996ish. How To Retrofit an AC System R-12 to R-134a -EricTheCarGuy

[TamiyaRunner]

Perfect timing with this video, Eric.  I have a 1985 Chevy Blazer and a 1994 Camaro both with R12 systems, and neither of them work.  Thank you for sharing this.

[robs]

During the Schrader valve launch, Cameraman Brian remained perfectly still for the sake of the footage. However, later that night realized he had the Shrader valve lodged in the back of his neck!!!

[nik]

Geez Eric, your videos lately have been syncing up oddly well with what we're covering in my classes. We just moved on to HVAC systems two weeks ago, and here you are with a very applicable video! Great video as always Eric, I'm happy to see firsthand how to convert an R-12 system to an R-124a.

[reedthetradesmen]

just helped me tremendously!
I'm a bit guy as we all are. was attempting to change Schrader valves and the low side was seized. thankfully it was retrofitted and after watching your video, I know realize it was able to just tread off. thanks for your insight and knowledge base! ETCG real deal

[ketoninja]

I think a mechanically inclined person could become a pretty decent Honda mechanic simply by watching this guy's videos.

ETCG, you are the MAN.  Thanks for another great video.

[daverohn]

I have a 1968 Cadillac with only 14K miles on it and the system has leaked out over the last 30 years that it was in storage. I was wondering how to get the AC back up and running, and this video answers that question. Thanks for making it!

[JoeyHeartthrob]

i love this video because it shows that its OK to make mistakes and that you dont know everyting

[MrXSmasher]

I want to take a second to thank you Eric for making these videos. They've helped me so much. I currently study automotive and the help u give mixed with lecture and practice is amazing. Ur the best :)

[rodolfoherrera]

I've found that replacing the expansion valve makes a huge difference when either refilling 134/12 specially so if you are retrofitting. Thanks for the video !

[Isjix]

A few hints for R-12 to R-134a conversions if it is just not cooling good enough for you are a few common issues, but not limited to endless possibilities of multiple issues, but some to especially consider:
1. Replacing the condenser with a parallel flow-type condenser (R-134a, interchangable with R-12 also) in place of the large tube and fin (R-12) condenser for better heat dissipation.
2. Replace the cycling switch (usually located on the accumulator) with one calibrated for R-134a; as it cuts off at the proper PSI range, compared to R-12 pressures.
3. Check your mechanical fan clutch. these wear out and will not spin the fan fast enough to pull sufficient air-flow through your condenser. (most noticeable at idle) (also check your shroud)
4. Too much oil in the system. Look up the proper oil capacity for your vehicle.
5. Dirty evaporator (short-cycling, low air-flow. check your cabin air-filter if equipped)
6. Dirty orifice tube/expansion valve (from not flushing the whole system properly)
7. Air in system

[jonathanclark]

Attempting to retro my 90 Accord EX. Will let you know how it goes. Shocks, struts, upper control arms, brake pads, rotors, wheel bearings have all been a sinch thanks to your videos. I appreciate your work and efforts ETCG. Especially when you make an error and show us at home that it not only happens, but that it's OK and fixable. Keep up the wonderful work!!

[taoh]

I loved how cold the AC was when I had my 91 240SX, it never leaked so I never had a reason to retrofit and it was ice cold every time I needed to use it. Unfortunately, that reliable old car is no longer with me.

[petersomthing]

we watch these videos to learn, thanks Eric keep up the good work

[johnkaplanian]

Dear Eric. Thank you indeed for the lovely video as usual (I call it real life videos). I and probably every one knows that nothing surpasses the American Cars ACs in terms of great cooling capacity, Have a great time and keep bombarding us with your videos.

[usmale]

This is a great video for anyone with a car or truck still using R12 refrigerant in their vehicle's AC.  You did warn people not to over-tighten their AC fittings.  That's critical.  AC lines are made from aluminum and strip very easily, so that's a possibility that everyone should be aware of before they begin.  You mentioned that vehicles made prior to 1996 were likely to use R12 refrigerant in their air conditioners, but both of my 1994 vehicles (Toyota Corolla and Dodge Dakota) were factory equipped with ACs that use R134a.  There should be a sticker somewhere under the hood--and probably in the owner's manual--that lists the type or refrigerant used.  Keep up the good work!

[brandonfinkbiner]

glad you will admit when something you do doesn't work out, but you follow up with the correct thing.

[Arizona]

I know this is an old one but it’s new to me and I’m using all the info. Thanks Eric 🤙

[GrafKroete]

Another great video about something I had to do to my Prelude...
 Luckily I have access to a professional service unit for A/Cs.