| How much R-134? [message #271064] |
Mon, 02 February 2015 17:09  |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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Need to replace my a/c compreesor, clutch bearing is gone, can't get the clutch off even with a puller, and the whole assembly is not that much more than just the clutch.
Issue is I would have to evac and recharge the system. It has been converted to R134, and I have access to the equipment at work.
My question is how much freon (R134) does this system hold?
Also, could use a recommendation on a replacement. Thanks.
77
403
R.D.
Northeast Florida
77 ex-Palm Beach 403
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| Re: How much R-134? [message #271073 is a reply to message #271064] |
Mon, 02 February 2015 19:10  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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I have no idea how much R-134 it would take to refill your system as I have never known anyone one to use R-134 in a GMC. I have a 30 pound take here and I would just hook it up and start charging until the pressures are correct. Everyone I know has used R-12 or Duracool in a GMC. I would suggest that you just recharge it using gauges until you get the correct pressures. It probably will take around 3 cans so just get 4 cans and start filling is until you get the correct pressures.
Now for the sales pitch. If it were me I would recharge it with with Duracool. 2.5 to 3 cans will do the trick and you will have a much better performing system.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Mon, 02 February 2015 19:53] Report message to a moderator |
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| Re: [GMCnet] How much R-134? [message #271080 is a reply to message #271073] |
Mon, 02 February 2015 19:43 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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Hi Ken,
For some reason I did not receive the message on the mailing list to which you are replying...but I agree with you 100% on Duracool vs. 134. I did a _proper_ 134 conversion (O-rings, oil, complete vacuum pump-down before charging etc) and was sorely disappointed in the performance. The system never produced acceptable cooling in the cabin and the compressor belt was constantly chirping or screaming no matter what tension I put on it or what type of belt/pulley combination that I used. After one summer of this nonsense we evacuated the 134 out of the system and replaced it with Duracool and now the thing will get cold enough to condense nitrogen out of the air. This is with an all-stock system...stock compressor, condenser, evaporator.
I realize that many guys have been successful in their R-134A conversions and I say "more power to them"... however I couldn't get it to work in my circumstance. I've had the current inventory of duracool in place for three years now and I've never had to top it off nor fiddle with the system in any other way.
--Jim "saving the lives of Onans...one unit at a time" Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
On Feb 2, 2015, at 8:10 PM, Ken Burton wrote:
> I have no idea how much R-134 it would take to refill your system as I have never known anyone one to use R-134 in a GMC. II have a 30 pound take
> here and I woudl just hoo it up and start charging untilthe pressures are correct. Everyone I know has used R-12 or Duracool in a GMC. I would
> suggest that you just recharge it using gauges until you get the correct pressures. It probably will take around 3 cans so just get 4 cans and start
> filling is until you get the correct pressures.
>
> Now for the sales pitch. If it were me I would recharge it with with Duracool. 2.5 to 3 cans will do the trick and you will have a much better
> performing system.
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: How much R-134? [message #271109 is a reply to message #271064] |
Tue, 03 February 2015 12:04 |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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Senior Member |
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Well thanks anyway. My system works fine with the 134 even here in Florida.
Only problem was the bearing went in the clutch.
R.D.
Northeast Florida
77 ex-Palm Beach 403
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| Re: How much R-134? [message #271114 is a reply to message #271064] |
Tue, 03 February 2015 15:20 |
biggreen
Messages: 347
Registered: June 2011
Location: Northeast Florida
Karma: 1
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Senior Member |
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Just in case anyone is interested in the answer to my question, I found the proper R134a charge is 10% less than R-12 in a former R-12 system.
R.D.
Northeast Florida
77 ex-Palm Beach 403
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| Re: How much R-134? [message #271134 is a reply to message #271064] |
Tue, 03 February 2015 19:33 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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biggreen wrote on Mon, 02 February 2015 16:09Need to replace my a/c compreesor, clutch bearing is gone, can't get the clutch off even with a puller, and the whole assembly is not that much more than just the clutch.
Issue is I would have to evac and recharge the system. It has been converted to R134, and I have access to the equipment at work.
My question is how much freon (R134) does this system hold?
Also, could use a recommendation on a replacement. Thanks.
77
403
I converted to 134 about 15 or more years ago and I recall I used about 2.5 pounds. The final amount is best determined by measuring the outlet temp and increasing and then decreasing the charge a bit. I was very stisfied with the performance compared to R12--just a slight reduction. Now I am running Duracool which I feel is the best the system has ever been.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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