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Danny_Ocean's Avatar
 
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R134 fittings vs. R12 fittings?

Are the re-fill fittings on the compressor the same for both R134 refrigerant vs. R12? Can you "accidentally" fill a R134 system with R12 or are there two completely different fill adapters?
Old 05-26-2007, 12:01 PM
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They are completely different for just that reason.
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Old 05-26-2007, 12:08 PM
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Whew...thanks.
Old 05-26-2007, 12:23 PM
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There is not really an easy answer for these questions. If it was converted properly, you should not be able to get the two mixed, but if not properly converted or altered, watch out. Here is why. If the compressor was originally a R12 compressor and someone converted the system to use R134a, you could still possibly have the R12 fittings on your fill ports. If is was done as should be, there would now be the R134a type fittings on it. If it was a R134a factory type replacement compressor and the other parts had been changed to R134a type equipement, it should be R134a only type fittings on it then. I have seen R12 systems that have been changed to R134a, and they still have the R12 fittings. There is a lot of differences between the R12 and the R134a fittings, you can't mistake them. Yes, you can accidently fill a converted R134a system with R12, only if they left the R12 fittings on it. The fittings themself are so far apart from the function and operation, one will not interchange with the other. That is, like I stated, if someone did not properly change out the fittings. The kits to convert, have the various fittings that are required for the change, plus they also have WARNING stickers, to warn that the system has been converted. I have also seen some, not so much on the up and up, used car dealers, actually top off a R12 system car with the much, much cheaper R134a out of the 30lb jug, by using a hose end adapter, without ever changing the cars fittings or placing warning labels anywhere. Then the "new" buyer wonders why their A/C quit just a day or so after they bought it. SCUMBAG USED CAR DEALERS!!! Hopefully some others will respond and give you their opinions on this subject. Good luck.
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Last edited by 3.2 CAB; 05-26-2007 at 12:33 PM..
Old 05-26-2007, 12:30 PM
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I purchased an R134 re-fill kit which (I assume) has an R134 adapter on the fill hose. The fill hose fit perfectly on my compressor and charged the system.

So...I think I'm OK, yes? If my system was still R12 (or an R12 conversion done improperly), my R134 hose wouldn't have fit...?
Old 05-26-2007, 02:52 PM
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Quote:
Originally posted by Danny_Ocean
I purchased an R134 re-fill kit which (I assume) has an R134 adapter on the fill hose. The fill hose fit perfectly on my compressor and charged the system.

So...I think I'm OK, yes? If my system was still R12 (or an R12 conversion done improperly), my R134 hose wouldn't have fit...?
If your system was originally R-12 but now has the R-134 fitting which it sounds like it does since your R-134 refill kit fit, then you should be fine.

Scott
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Old 05-26-2007, 03:26 PM
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