yes i'm sure call around and see bout having your R12 vacumed out they should do it for free. Mixing is not an issue now but was when 134a first came out. But if your R12 isn't pure they probably won't do it for free cause your R12 will be useless. When you take it down to the shop they will vacum yours out pressure test it and if it has no leaks then they will fill with 134a on your discression only thing there is to changs is the adapter to fill it. BUT there are some people that says the oil thats in the changeover kits you buy say that not all compressors hold the same amount of oil some hold more and some hold less. That would be the only problem is if your not running enough oil but i dont' know if thats entirely true or not about compressors being different on amount of oil.


And another thing i dont' know if there is a such thing as "Bad" freon unless its been contaminated with other freon or some other substance all you might needs is a recharge. All vehicles leak a certain amount of freon even the new ones but it is very very very small amount this is the reason R12 is made anymore cause its not as Ozone friendly as 134a.

 

i guess it's going to cost me money now to have it vaced out, cause the system has r12 and 134a in it. well if anyone else has any input on this subject let me know.

 

that can't be good
did you mix the 2
i don't know what would happen if you mixed the 2 never heard of anybody doin it just hope it don't mess stuff up by mixin the 2

 

Even though I have 8 can of R-12(bought before the ban) I will retro my pickup with 134A when I get it running in the summer.

 

I had my truck converted over since it cost me only double what it would have cost just to refill with R12. Plus, they replaced a front seal in my compressor, which would have had to be done anyway, even if it were refilled with R12. So for an extra 100 bucks or so, I have R134a in it, and should it need refilling again, it will only cost 30 bucks or so as opposed to ~150 for the same amount of R12. I don't have any experience with do it yourself kits, I've always felt that I'd leave that work up to someone who knows what they are doing. The fittings are different, and they replaced my accumulator and flushed the system before refilling with 134a. If your system has leaked the R12 out, that happens, but if it is still full and you are planning on releasing it, please don't. CFC's in the freon combine with free O2 molecules in the atmosphere which prevent O3 ions from forming. O3 is ozone and is what absorbs UV radiation from the sun. UV hits it, breaks it into O and O2, and are continually breaking apart and reforming. CFC's disrupt the reforming process, so there is less material up there to absorb UV radiation, and all us white folks get skin cancer. My point is, if the system breaks, there's nothing we can do about that, but if it's not broken and you release it, you are (intentionally or not) destroying the ozone for years to come.

 

I'm new here guys and I have a few questions I hope someone can answer.
I'm asking on behalf of a friend who has a '77 F-150 with a 351M engine. There is no fixed orifice tube in this one, but an expansion valve.
1) Is the best way to disconnect the expansion valve to pull the evaporator into the cab or to disconnect it under the hood?

and

2) How much oil should be in the compressor?

3) Does anyone have a link to a step by step instruction for the r-12 to 134-a conversion process? The r-12 WILL be evacuated responsibly.

thanks

 

924x2150, I neglected to say in my post that I had the ASE Refrigerant Recovery & Recycling Review Certification Program. Got the certification when I went to Lincoln Tech in the Diesel Technology course.

 

OK, BillC,I'll call the Feds and tell them to rip up the warrant.
The point of this entire conversation...Do it right the first time, cause the A/C is an expensive toy to play with. R12 is hazardous, everyone should believe it, even if you never took any chemistry courses, it wasn't banned for bogus reasons.

 

I have a 89 F250 with AC which doesn't work - I got it like that, not sure what's wrong. I was told it needs that conversion.

Can someone point out what specifically needs to be replaced? A web page maybe? I got all the factory manuals, even a AC/heater hose manual but I don't know anything about A/C. Might have to take it somewhere for them to do it, but at least I want to sound intelligent doing it.

 

all you need is the old stuff vacumed out and a changeover kit only thing there is to change is 2 adapters which goes on over the R12 fitings

 

Guys,
Can anyone tell me how much or how deep the oil should be in the compressor? This is for a 77 F 150 that has been converted to 134-a.

Thanks

 

Refrigerant wars... Visions of the cyclamate lie. Yes, when R-12 is released into the atmosphere it does react with O2 & free oxygen molecules which does (theoretically) cut atmospheric O3 (ozone). However, it may be the height of arrogance to presume that mere man can produce & release enough of this substance to have a measurable long term impact on UV rays at & near mean sea level.

There are so many other naturally occurring phenomena also at work that man's meager activities pale in comparison. While all this "ozone depleting" activity is occurring "ozone regenerating" processes are at work restoring O3 levels; most notable: lightning. Each lightning bolt (hundreds per second around the globe) superheats the air and forms more O3. While man "destroys" ozone we also restore it with thousands - no, millions - of electric appliances whose arcs and sparks accomplish the same end as lightning.

No, the greatest safety issue with R-12 is that when introduced into the combustion process of an engine deadly phosgene gas is produced. Couple this fact with R-134a's much more corrosive nature and you can see that we are, quite literally, "picking our poison". P.T. Barnum is once again validated...

Either way, be careful with whatever you do and be aware that with any older system various components (compressor, receiver/dryer, etc.) should probably be replaced anyway. Considering that R-134a runs at higher pressures than R-12 more stress is placed on these components.

dn.

 

R12 is not the only source of CFC's to be released into the atmosphere. Styrofoam, aerosol spray cans, etc., all contained CFC's, as well as freon (R12). Plus millions and millions of people who used these products, equals quite a bit of CFC's in the air. The ozone layer is high above the layer of the atmosphere where lightning occurs, and is much much higher to be affected by anything we do here at earth's surface. It takes quite a while for the O3 levels to build back up. I'm not a tree hugger by any means, but this is why production has ceased for R12, and why there are no longer CFC's used as propellants in aerosol cans.