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Old May 28, 2008 | 04:12 PM
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Default Ac Psi Question

Does anyone know what psi to charge the ac to im using 134a
1975 L-48
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Old May 28, 2008 | 05:40 PM
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you're not looking for a psi, but an amount of freon in pounds or ounces. it is usually written on the tag on top of the compressor. it will be the same amount for r12 or 134a.
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Old May 28, 2008 | 06:08 PM
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Originally Posted by chris75stingray
you're not looking for a psi, but an amount of freon in pounds or ounces. it is usually written on the tag on top of the compressor. it will be the same amount for r12 or 134a.

RONG, it will be about 50-75% of the R12 figger....you overcharge 134 and you get nothing outta the system....

BTDT many times....I find that most vechicles do fine with UP TO 24 oz, that is 2 cans of r134,


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Old May 28, 2008 | 06:21 PM
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Originally Posted by mrvette
RONG, it will be about 50-75% of the R12 figger....you overcharge 134 and you get nothing outta the system....

BTDT many times....I find that most vechicles do fine with UP TO 24 oz, that is 2 cans of r134,


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Old May 28, 2008 | 07:45 PM
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oh ok. you learn something new everyday
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Old May 28, 2008 | 08:25 PM
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This may provide some helpful info on R134a to some...

http://www.id-usa.com/how_to.asp
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Old May 28, 2008 | 09:26 PM
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My '81's service manual said 3 lbs of R12 (48oz). I use three 13 oz cans of r134 and it seems perfect. God bless, Sensei
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Old May 28, 2008 | 09:54 PM
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Originally Posted by TheSkunkWorks
This may provide some helpful info on R134a to some...

http://www.id-usa.com/how_to.asp
As showing in the photo on that page A guage is on the fill hose is very cheap & would be the way togo.
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