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Old 07-07-2016, 02:24 PM   #1
SkylineWalkrGTR
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How do i know what refrigerant i have (r12 or r134a)?

my AC is running pretty weak especially during the day, so i want to recharge the system, but i dont know if the previous owner had a conversion and i should just refill it with 134a or if its still stock and i need to refill with r12.

1990 Accord EX
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Old 07-07-2016, 02:52 PM   #2
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If your AC is weak, then there might be a leak.

This means that if you refill it that all of the new stuff will leak out as well.

It is best to take it to a mechanic who is experienced with AC components. They will be able to tell you if the conversion was done or not. If it hasn't been done, then you should most likely purchase a conversion kit. R12 should not be used anymore.
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Old 07-07-2016, 03:25 PM   #3
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Check the low pressure service port. It's right behind the radiator near the radiator cap.

Is the connector threaded or non-threaded?

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Old 07-07-2016, 05:01 PM   #4
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I have heard of instances where a system was converted to r134a without changing the fittings. I've also heard of instances where the fittings were changed, but r12 was still used (it's not legal to sell it anymore, but it's still available if you know where to look...)

Taking it to a professional is probably your best bet. If you put the wrong stuff in, it'll do damage. If there's a leak, as said, whatever you put in will just leak out again (and that's not good for the environment.)
I'm experiencing this same situation with the 1990 Miata I just bought, and I've arrived at the same conclusion... taking it to a pro.
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Old 07-07-2016, 07:48 PM   #5
SkylineWalkrGTR
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alright looks like thats what ill have to do later this week then lol, thanks you
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Old 07-08-2016, 01:05 PM   #6
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Fun fact..

All cars 1994 and up are charged with r134a. 1993 and older should be r12 unless retrofitted.

Be cautious of retrofitted systems that don't have a sticker or proof showing it was done correctly. The two freon types DO mix, but the oil doesn't. The mixing can cause parts of the system to fail.
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Old 07-08-2016, 01:12 PM   #7
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Given the age of these cars, many of them have likely been retrofitted (properly or improperly) by now. I know I certainly wouldn't be able to identify a correctly done retrofit myself.
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Old 07-09-2016, 05:42 AM   #8
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You know the little window on the drier? use them to check for air in the system, but sometimes when oils mix, you can see the brown nasty stuff flowing in there.
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Old 07-14-2016, 07:59 PM   #9
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Quote:
Originally Posted by SkylineWalkrGTR View Post
my AC is running pretty weak especially during the day, so i want to recharge the system, but i dont know if the previous owner had a conversion and i should just refill it with 134a or if its still stock and i need to refill with r12.

1990 Accord EX
-I've got AC Issues as well and I found this one out the hard way. So, On my AC compressor, it says right on it that its an R12 system. Theres a little sticker on the left side of it if you're looking into the hood from the front of the car. Its very possible that its too dirty/dusty to see initially, but wipe it off and look for a sticker down there.

Another indication that I had was that when I tried to refill mine with R134A, I soon found that the fitting that comes with the R134A can doesn't fit on the cars Schrader Valve.

I still havent gotten around to fixing mine yet, but the link that I was given on how to do an R12 to R134A retrofit is here:

http://www.cb7tuner.com/vbb/showthread.php?t=165508

-I've decided against retrofitting mine, and am going to replace the drier, drain the system, and fill w/R134A after searching for leaks.
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Old 07-14-2016, 08:29 PM   #10
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Quote:
Originally Posted by F22Chris View Post
Fun fact..

All cars 1994 and up are charged with r134a. 1993 and older should be r12 unless retrofitted.

Be cautious of retrofitted systems that don't have a sticker or proof showing it was done correctly. The two freon types DO mix, but the oil doesn't. The mixing can cause parts of the system to fail.
This.

PAG is the most common oil for R134a. Mineral oil is for R12. PAG and mineral oil don't mix. However Ester oil is compatible with both.

Quote:
Originally Posted by F22Chris View Post
You know the little window on the drier? use them to check for air in the system, but sometimes when oils mix, you can see the brown nasty stuff flowing in there.
Unfortunately most replacement driers don't have the sight glass. It's not completely necessary but I like it.

The fully functional R12 system in my 1993 LX still has the sight glass.
The fully functional R134A retrofit in my 1993 EX doesn't have the sight glass as I didn't purchase a drier with one.

The factory R12 system in my 1993 LX is much much colder than the retrofitted R134A system in my 1993 EX. Not too surprising being as the system was designed to operate on R12.

However, my R12 CB7's A/C is colder than my boss's 2016 Kia Sorento's A/C. I haven't put a thermometer in either yet but my R12 system is noticeably colder in comparison to the 2016 Kia Sorento. R12 is awesome if it's possible for a person to stick with the R12.

Great info your spreading around Chris, I've done the full retrofit myself as I'm sure remember and been inside both Denso and Hadsys compressors. Your spot on as for what I've learned through hands on experience and it's good to see the right information being tossed about. +1 rep for ya bud
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Old 07-14-2016, 09:18 PM   #11
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Why thank you, Josh. I guess I did learn something in college.
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Old 07-14-2016, 10:15 PM   #12
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I'm guessing I'm lucky with my AC system. Grandpa owns and hvac business and has 10 or so 30lb r12 cylinders laying around. Plus the r12 compatible replacements called freeze12,hot shot, etc.

On my white honda I bought a recharge kit from envirosafe. It's the ONLY way to recharge your r12 system without converting it if you don't have the resources I have.

The case I had on the white cb is that the seals in the comp needed conditioning which envirosafe sells so I got lucky with not having to rebuild

All in all I would highly recommend fixing your leaks and going the envirosafe route. It's blows much colder and will cost a lot less from a conversion stand point
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Old 07-14-2016, 10:19 PM   #13
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http://www.es-refrigerants.com/produ...4a/details.asp

This is what I bought back in 2011. Still blows cold to this day
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Old 07-15-2016, 07:49 AM   #14
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Quote:
Originally Posted by F22Chris View Post
Fun fact..

All cars 1994 and up are charged with r134a. 1993 and older should be r12 unless retrofitted.

Be cautious of retrofitted systems that don't have a sticker or proof showing it was done correctly. The two freon types DO mix, but the oil doesn't. The mixing can cause parts of the system to fail.
When I had my sister's 1993 Acura Legend I found out it had a r134a system from the factory, my 1993 Honda Accord has a r12 system.
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Old 07-15-2016, 05:30 PM   #15
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Quote:
Originally Posted by talonted1990 View Post
When I had my sister's 1993 Acura Legend I found out it had a r134a system from the factory, my 1993 Honda Accord has a r12 system.
If her car was made summer of 93, it would be considered a 94.
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Old 07-19-2016, 10:10 AM   #16
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check out Servicing Stop as they fix anything and everything to do with cars and have a brilliant service, they pick your car up, fix it and drop it back off! Plus 50% off your service!
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