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#1
06-06-2011, 10:17 PM
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Finally charged AC with 134, how much is needed?
I finally vacummned my AC system down in my 70 GTO. Everything in the sytem is brand new from a completed frame off resto from late last summer. I also have the POA replacement valve with the low pressure switch. After discovering my guages on my manifold set are screwed up, I just vacummned the system down for about 20 minutes then charged it.
Originally the system is suppose to have 4 lbs of R-12 in it. When using R-134, the amount use is suppose to be about 15-20% less. 4lbs of R-12 equals 64 ounces. Minus 20% makes it around 51 ounces. I charged the system with 3 cans of 134, 36 ounces. I was planning on one more can making it a total of 48 but when I checked inside the car, the air was cold and felt perfect. Does this sound about right for the amount of 134 I've used or should I charge it with one more can? The pressure switch is suppose to comes on at 22 PSI and cycle off at 44 PSI +/-3 PSI from what the paperwork says. My manifold guages are not reading accurate so I couldn't get a correct low side pressure reading so not sure what the pressure actually is but do know the compressor never cycled so I must be under 44 PSI. Any input on this would be appreciated.
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74 GTO Bracket/Street car and another 74 for the wifey to race with! 70 GTO 400, 4 spd, #'s matching and a little to nice for me to own. Friendship is like peeing your pants..everyone can see it but only you can feel the warmth! |
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