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Old 04-14-2006, 12:39 AM
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Join Date: Sep 2004
Posts: 36
R-12 substitute

Has anyone used the "Freeze-12" product and if so will it mix with R-12?There is a shop in Hunsville, TX that said they were licensed by the company as an exclusive installer.

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Old 04-14-2006, 01:45 AM
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Join Date: Dec 2000
Location: Battle Ground, WA
Posts: 576

Hi there,
Most all the R-12 substitues are a blend of butane and propane, in a percentage to produce approximately the same cooling effect as R-12. They work fine as long as there's no leak in the system. They are compatible with both mineral and PAG oils. (I don't have personal experience with the PAG oils, however, just repeating what I've read.) They are actually more efficient at cooling than R-12 is.
The problem is that the system MUST be labled that there is an R-12 substitute in the system. Failure to do so is against the law! Also, if there is a leak in the system, (and there almost ALWAYS is,) the percentage of butane and propane will change, and then the system won't work as designed after awhile when one of the gasses leaks out in a greater percentage than the other.
Interestingly enough, these gasses are used in many countries around the world instead of R-12, completely legally. They are environmentally friendly, even when leaked into the atmosphere. There is a slight danger of fire if they leak into the engine compartment in a large volume, but no worse than a can of hair spray.
If one uses them be aware that the liquid volume of these gasses is much different than R-12 - it takes much less to fill the system. If I remember correctly, it's on the order of 1/3 the quantity by weight.
Don't try to mix butane and propane to approximate the same thing, as the substitutes like Freeze-12 have been filtered and more water has been removed from the gases. Using regular butane and propane may rust out the AC system from the inside out.
I am personally aware of a Jag that has been using this stuff for 7 yrs now with no ill effects...

I'm sure that others will have plenty to comment on regarding this subject.

Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C
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Old 04-14-2006, 02:33 AM
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Join Date: Mar 2006
Posts: 8
Thumbs up

I am a hvac 15 yr service tech I have it in my 85 500sel works great.I would
recomend it
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Old 04-14-2006, 03:30 AM
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Join Date: Feb 2006
Location: Louisiana266 Maloy Rd winnfield71483
Posts: 804
freez 12

The freez 12 works even beter in my opinion.I allso run it in my 90 420sel,cools very well.just-n-time
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Old 04-14-2006, 08:37 AM
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Join Date: May 2004
Location: Houston, Texas
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Originally Posted by Paul J C
There is a shop in Hunsville, TX that said they were licensed by the company as an exclusive installer.
That part is BS - Freeze 12 doesn't license anybody as an "exclusive installer". So (a) you need to keep an eye on the one who told you that, but (b) Freeze 12 works very well - I did a full charge on one of my past vehicles with it.
- Brian

1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600
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Old 04-14-2006, 09:01 AM
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Location: Hells half acre (Great Falls, Virginia)
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Get your 609 certification to buy and use the real stuff. FREON R-12. Nothing is better. Its not that difficult to get it.

Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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