grovedogg

I have an 84 Runner with A/C, but it's outdated (R12) expensive I know...
I've read up on updating the current setup to R134, seems to be quite simple.
But upon more thinking (maybe thought too much ) but, wouldn't it be easy to replace the whole compressor with a newer unit out of a later model 22re? or are there many differences between the two?
I am ready to pull it apart, and re-oil , along with replacing hoses where needed, but before I start any info?
Thanks

86tuning

Nah all you need is to recover what's left of the R12. Next, put on a couple conversion fittings, vacuum the system for 30 mins and then check for leaks. Install new oil and refridgerant (but 20% less of R134a than R12 by weight).

You're supposed to replace the receiver-dryer, but meh, you can do that next year

grovedogg

I heard you have to replace O-rings and gaskets/seals and possible hoses because the R134 consists of smaller molecules than the R12, therefore would (possibly) leak thru the pores in the old hoses?
Hmmm. More info, anybodY?

Oatmeal

Is your current system not working or did you just decide to "update" it to R134A? First of all, R134A runs much higher head pressures (harder on your compressor) so, if you go that route, do replace the o-rings to the "green" ones designed for R134A also, it's not as efficient as R12 (R134A systems make up for this deficiency by using bigger evaporator and condensor cores) so, it'll take longer to cool your vehicle's interior and it's always a good idea to replace the filter/drier. You might look into Freeze12, it mirrors the characteristics of R12 and cools just as well. I run it in my '85's system and have been very happy with it.......especially after blowing my first compressor on R134A and afterwards losing my precious R12 to a loose fitting! ........use Loctite---------Hans

Oatmeal

Here read this: http://www.freeze12.com/ and you can get the cans at Pep Boys!---------Hans

anotherjeff

Why not use R12? Cans are available one ebay, and elsewhere, for $20-$30.
R12 systems function best with R12!

CC_yota

I believe you have to have a license to buy R12, plus with R134a you're only paying like $6 a can.

86tuning

Freeze12 and Duracool and other 'hydrocarbon' refridgerants are basically propane in a can.

R134a may not be as efficient, and may seep through o-rings, but a basic conversion is pretty easy to do, even if you don't change any o-rings and stuff. Just vacuum it down for an extra 15 mins, and then charge it up. Deal with leaks and stuff next year. Or just top it up next spring.

Me = lazy. R134a is non ODS and is preferred over R12 for that reason. Plus price.

grovedogg

thanks for the link, i was under the impression that R12 was like "gold" hmm. I also followed some links reading up about the Freeze 12 and also Enviro-Safe E12a which is another "environmentally save" alternative. But there have been comments about moisture being in the system after using these additives, causing "rust" in some cases.
I might just break some bread, or check out that Freeze12, did you have to change anything? or just charge it up? much appreciated! its gettin hot FAST!

I haven't changed my system, no a/c since i bought it several months ago, but i think it's just outta "gas" whichever "gas" i decide to put in.

grovedogg

well, just called the local Napa store, they carry the Freeze12 on shelf for $8.99 a can.
I am going ahead with that route, if it don't work, they I can vacuum the system, and replace with 134a.

Oatmeal

From the link I posted: FREEZE 12™ is EPA acceptable for mobile applications subject to the use conditions applicable to motor vehicle air conditioning.

FREEZE 12™ is an ideal replacement for R-12 requiring no extensive training.

FREEZE 12™ is a patented product.

FREEZE 12™ is non-flammable and contains no CFC'S.

FREEZE 12™ is made from readily available raw materials.

FREEZE 12™ requires no system flushes or lubricant change. It works with the existing R-12 lubricant.

FREEZE 12™ has been sold for several years and has been installed successfully in thousands of makes and models without problems. Conversion simply requires different fittings and labels which are available through H&H Co. (Click any store button or Call (888)903-7111

FREEZE 12™ is the ideal replacement for older R-12 A/C systems that normally require expensive retrofitting to R-134a.

FREEZE 12™ is priced way below R-12.

FREEZE 12™ is lighter than R-12 therefore you will not have to use as much. Approximately 90% of the required R-12 charge is all that is needed.

It's not "basically propane in a can" that would make it, let's see........flammable. And R134A, as well as most other replacement refrigerants, is a blend (that's why you invert the can and introduce it as a liquid) so, if a leak does occur, it may upset the balance of the mixture and simply adding more may not restore cooling efficiency. And just for the record, I've done quite a bit of research before going this route and read that propane is one of the most efficient medias for moving heat but, would be too dangerous........that's why it ISN'T used. Also, moisture in the system would only come from incomplete or improper evacuation. When hooking up the hoses to the refrigerant source, it's very important to bleed any air from them before cracking open the charging valves ---------Hans

deserttoy84

must be nice to have AC... anyone have a complete system sitting on their truck that your never going to use??

BigO

Or better yet, two complete systems sitting in thier garage, I could use one too.
My Washington state truck does not like the 95 deg heat and humidity down here in Georgia.

deserttoy84

hey hey hey... wait in line

Oatmeal

My truck didn't have A/C when I bought it, pulled it out of a truck my buddy was parting out. My truck is my daily driver/work truck as well so, A/C is very welcome, in fact, I'm the envy of my Cruiser and Jeep buddies because, I wheel with the windows up and the A/C chill'n ---------Hans

deserttoy84

so the install was fairly easy? problem i think im going to have is finding all the little stuff.

Oatmeal

It's all plug n' play. Toyota even has the firewall dimpled to mark the spots you drill (hole saw) for your hoses to come through. Took about three hours to install! Just find a wrecked truck and take everything yours dosen't have---------Hans

anotherjeff

Here's some local freon: http://chico.craigslist.org/pts/731588165.html

(3 cans for $70)

RandyatBBY

My 1985 4Runner did not have the AC working when I got it in Nov. 07 I did all the reaoirs to get it in the road. then the summer heat was coming and we charged the system with three cans of R-12 and it works great. Good luck!

grovedogg

well, i guess i have a leak... i had the system vaccumed, and charged it with the 134, found that I need to replace the 0-rings, theres still air in the system so it blows cold, then mild, then warm, and back again... doh.