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Author
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Topic: Switch to R134a?
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SugarlandStang
Journeyman Posts: 98
From: Sugar Land, TX
Registered: Dec 2005
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posted 04-20-2006 10:29 PM
 
On to my next project...installing a new A/C compressor and dryer on my 67. It's getting hot around here! Since I have to buy a new compressor (old one is gone), I thought I'd go with R134 refrigerant. Is there anything else I'd need to make the switch? Any A/C tips welcome.
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'68Coupe
Journeyman Posts: 40
From: Los Angeles, CA, USA
Registered: Apr 2006
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posted 04-20-2006 10:44 PM
R134 is pretty much the way to go...less expensive, almost as efficeint...plus, a lot of shops arent licenced to work with R12 anymore, but most shops have no issues with R134.I think Sanden makes compressors that work with stock Mustang A/C parts, plus theyre not half as ugly as those stock ford units. www.sanden.com ------------------
- 1968 coupe, vinyl top
- 289ci
- Hooker full length headers
- Factory A/C
- Edelbrock 1403 carb
- Edelbrock intake
- Griffin radiator (stock replacement)
- Ignitor II
- Koni classics front and rear
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Toronado3800
Gearhead Posts: 1163
From: St. Louis, MO
Registered: Jul 2001
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posted 04-21-2006 12:29 AM
When 134A first came out the shop attached to the tow-truck place I worked for sold a couple $1,000 plus conversion kits.  Since you have to buy a few parts just go with the 134A compressor. I wouldn't worry about replacing every seal in the system unless it just won't hold 134A, and then it probably wouldn't hold R12 anyways. Example, for about 60,000 miles I ran 134A in the R12 system in my oldsmobeater as kinda an experiment. First time it leaked out after fifteen minutes of driving. So we loaded up with leak finder, charged it again, and it held for a couple years. Wasn't as cold in that R12 system, especially at idle, but it was sure cheap.
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SNAKGUTS
Journeyman Posts: 81
From: Panama City Florida, USA
Registered: Feb 2006
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posted 04-21-2006 07:21 AM
contact the folks at Classic Auto Air (813)251-2356. They can probably help you out. I'm working on putting my A/C system back together. I put a new 6-circuit condenser and new evaporator in mine. The compressor is 1993 era. I'm currently fabrication hoses to hook it all up. JimBob ------------------
67 Coupe, Father bought new, Ford Racing 5.0L Crate motor (E303cam/X303heads) GT-40 EFI, Cobra Electronics, Tremec 5 speed. Maier Racing hood scoop/fender flares/suspension
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TOPDowNMUSTANG
Gearhead Posts: 281
From: Kennett Square, PA
Registered: Oct 2005
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posted 04-21-2006 01:28 PM
The only potential problems are if you're going to use the original condenser and evaporator. The original parts were designed for the properties of R12, which is a more efficient refrigerant than R134. What that means is your original condenser and evaporator are too small for the properties of R134. This means that the AC system won't get the air as cold as it would with R12.For example: I did the R134 conversion on my Explorer. Before the switch the air coming out of the vent was around 4o degrees. Now the coldest it will get is around 52 degrees. The real way to do it is to replace the condenser and evaporator with ones sized for R134 so that you will get 40-45 degree air. If you're going with a complete aftermarket setup it will already be sized for R134. ------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site
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TOPDowNMUSTANG
Gearhead Posts: 281
From: Kennett Square, PA
Registered: Oct 2005
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posted 04-21-2006 01:46 PM
Classic Auto Airhttp://www.classicautoair.com/default.asp ------------------
'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 04-21-2006 02:30 PM
anyone ever tried the freeze 12?? (fake r-12)------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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Jake11
Gearhead Posts: 246
From: Banning,Ca,USA
Registered: Oct 2005
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posted 04-21-2006 02:59 PM
134? Won't get as cold. Done a few. Need
a different expansion valve, dryer. Need to
flush the condenser and evaporater. Take the
compressor off, drain it and refill it with
134 oil. put it back together and pump it
down and fill it up. It should work fine.
Good luck, KP
All the other R12 substitutes are blends.
Stay away! Some have "Propane" mixed in.
Dangerous! [This message has been edited by Jake11 (edited 04-21-2006).]
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SugarlandStang
Journeyman Posts: 98
From: Sugar Land, TX
Registered: Dec 2005
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posted 04-21-2006 07:10 PM
Thanks everyone. I learned alot.
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rstrahan
Journeyman Posts: 6
From: Denton, TX, US
Registered: Jan 2006
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posted 04-21-2006 07:18 PM
I did it on my pickup. Took about 2 hours to do the whole thing, including evacuation. Cost was a couple hundred as opposed to the $750+ the shops were asking.
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66bluefb
Gearhead Posts: 537
From: Okla.City,Okla.
Registered: May 2002
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posted 04-22-2006 08:29 PM
quote:
Originally posted by capri man:
anyone ever tried the freeze 12?? (fake r-12)
I used the freeze 12 and it works just as good as R 12 or better.------------------
http://ourworld.cs.com/blagintony/myhomepage/auto.html
86-302 HO bored .030 over crank .010 under,
B-303 cam ,harland sharp roller rockers,
performer rpm intake, 625 carter,AFR 165 heads.C-4 2500 stall
,granada disc brakes, 85 duraspark ignition, pony interior,the who,the doors,and ccr full blast on the stereo
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capri man
Gearhead Posts: 8777
From: doerun, ga.
Registered: Nov 2000
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posted 04-22-2006 09:07 PM
same here blue.  ------------------
mike r
racing is real
everything else is just a game.
81 capri-302-7.25 @93mph 1/8
1.54 60ft 50 % of the fun dragracing is meeting people who will give you the shirt off their back to wipe the grease off your hands.
M&M member #839 http://i2.photobucket.com/albums/y6/mike470/adel2.jpg
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SugarlandStang
Journeyman Posts: 98
From: Sugar Land, TX
Registered: Dec 2005
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posted 04-23-2006 04:03 PM
This Freeze 12 sounds like what I'm looking for! I really wasn't fond of the idea of spending $1000 for a new compressor, condenser, evaporator, valve, dryer, etc. when all I needed to replace was the compressor and dryer. Nor was I fond of having a less efficent A/C. I live near Houston. Where in July and August, the devil has to go back to hell because it's too hot. Anyone have problems with Freeze 12?
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mikel3891
Gearhead Posts: 111
From: philippines
Registered: Sep 2005
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posted 04-25-2006 12:03 AM
I have a used compressor which I think has r12 oil in it. I purchased every other parts new that's compatible with r134 and r12. Can I just flush the oil from the compressor so I can use r134 on the system? or should I replace or rebuild the compressor?
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ewokeric
Gearhead Posts: 237
From: woodbridge, va united states
Registered: Mar 2002
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posted 04-27-2006 05:15 PM
you can also use 414b refrigerant it works with all oils just have to weigh in charge for a maxium of 80% orginal, and it is colder than r-12
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