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How well does 134a work in 60s &70 Mopar ?
#1674232
09/19/14 03:40 PM
09/19/14 03:40 PM
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Joined: Jan 2003
Posts: 1,043
Slidell, La.
doctor_mopar
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,043
Slidell, La.
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How well do the old systems work with conversion? In my case I have the factory condenser and clutch fan, but compressor is Sanden and have the Airtemp add on evaporator under the dash.
------------------------ It doesn't matter what you do.........As long as you look good doing it !
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: doctor_mopar]
#1674234
09/19/14 06:35 PM
09/19/14 06:35 PM
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Joined: Aug 2007
Posts: 2,356
Kentucky
dfsmopars
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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I've converted two completely factory systems in a '74 a body and a '72 b body and both blowed very cold and worked well. The a body is still going but the b body locked up after two Summers.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: stumpy]
#1674236
09/19/14 11:18 PM
09/19/14 11:18 PM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
super stock
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super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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by future do you mean 2018? That's when the current type of refrigerants will be phased out. Also you won't get the same level of cooling if you use R134a in a R12 system.
B5 Challenger T/A
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: doctor_mopar]
#1674238
09/20/14 12:31 AM
09/20/14 12:31 AM
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Joined: Jan 2003
Posts: 5,445
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,445
So Cal
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Why convert R12 can still be found... Check around especially the swap meets, usually sells for between $15-25 per 16 oz... I just bought several cans @ our local auto parts/tools /supplies swap meet... Just my $0.02... 
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: Sinitro]
#1674239
09/22/14 01:57 AM
09/22/14 01:57 AM
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Joined: Aug 2007
Posts: 6,096
Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,096
Valencia, España
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I'm running 134a without problems on stock assembly, just changing oil, seals, dryer ( or its content ), removing pressure valve from back of compressor and replaced with a temperature clutch cut off switch sensor wrapped around expansion valve, expansion valve readjusted ( or replaced )
Hoses needs to be replaced if they are worn, BUT if they are fine and were running R12 for long time they already "seasoned" enough to hold the smaller 134a molecules, doesn't need to be replaced. I just replaced when they ( still factory ones ) began to show leaks after couple of years.
I have not installed a clutch cut off switch though
( read from an old Mopar Muscle mag, and I did it on that way )
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: Scott Carl]
#1674244
09/22/14 03:17 PM
09/22/14 03:17 PM
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Joined: Nov 2006
Posts: 2,255
IL
furious70
top fuel
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top fuel
Joined: Nov 2006
Posts: 2,255
IL
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if you just need a top off now and again I'd stick with the R12 for sure. Quote:
Sorry for the hijack, but I've been following this thread and it's piqued my interest! I have an aftermarket ac unit from Sears that was originally R12 on my 74 Challenger. It was installed in 75. My dad left me the car, and among the spare parts was a 134a conversion kit (Basically just the different hi/low port nipples.) However, he also left a small tank of R12. I believe its a 30# tank(?) that feels about 3/4 full. What would you guys do? Make the conversion and sell the R12? (Is this legal?) Or run the R12 for as long as possible? I understand I would need a different type of compressor oil?? and most likely need to put in new seals due to the age of the unit that hasn't been run for over 10 years.
Thanks
Scott
70 Sport Fury
68 Charger
69 Coronet
72 RR
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: doctor_mopar]
#1674245
09/22/14 03:31 PM
09/22/14 03:31 PM
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Joined: Jan 2003
Posts: 25,849
Rio Linda, CA
John_Kunkel
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,849
Rio Linda, CA
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R134A sucks, all anecdotal tales to the contrary, but the OP might be committed to it because of the compressor he chose.
The INTERNET, the MISinformation superhighway
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: 63stabamatic]
#1674247
09/25/14 12:35 PM
09/25/14 12:35 PM
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Joined: Jan 2003
Posts: 28,068
Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,068
Irving, TX
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Cold is a subjective term.
An A/C system that works well where 90 degree temperatures are extreme may not work well where 100 degree temperatures are the norm.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: feets]
#1674248
09/25/14 02:02 PM
09/25/14 02:02 PM
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Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl
pro stock
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pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Quote:
Cold is a subjective term.
An A/C system that works well where 90 degree temperatures are extreme may not work well where 100 degree temperatures are the norm.
This supports a concept I learned in the A/C section of a community college automotive program I took some years ago. We learned that we really don't cool anything. We remove heat from it. Heat is an energy that can be controlled. Hence the name "air conditioning". The guys with a bunch of letters behind their names claim that until absolute zero temp is reached; –273.15°C or –459.67°F, heat can still be removed. Living in Nebraska, the jet stream removes enough heat from my bones, but I digress.... The point I'm trying to make (and my wife will vehemently debate this  ) A/C can only remove so much heat. If ambient temps are beyond what heat the system will remove, its going to seem like the system isn't working correctly.
OK, I think I'm rambling now due to caffeine deprivation....or maybe OD.
Scott 
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Re: How well does 134a work in 60s &70 Mopar ?
[Re: feets]
#1674251
09/27/14 08:34 AM
09/27/14 08:34 AM
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Joined: Sep 2003
Posts: 19,456
north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 19,456
north of coder
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Quote:
Quote:
We learned that we really don't cool anything. We remove heat from it.
Correct.
An excellent auto A/C system will drop the temps about 30 degrees below ambient.
When you're tooling along on am 85 degree day and kick on the A/C you'll get temps in the upper 50s.
Try that on a 110 degree day and the air blows at a bone chilling 80 degrees.
Turn on the recirculating air in a car that has been baking in the sun and it'll chill that 150 degree inside air down to a balmy 120 degrees.
Good A/C is relative.
and that is why fsms have performance graphs that show temperatures and pressures at specific outside temps through the interior ducts.
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