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Old 05-25-2013, 11:55 AM   #1
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AC pressure

how much pressure should be on the low side and the high side?
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Old 05-25-2013, 12:21 PM   #2
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With the compressor running or off?
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Battousai wins the "best explanation ever" award.
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Old 05-25-2013, 01:18 PM   #3
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both if you know them
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Old 05-25-2013, 06:19 PM   #4
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Quote:
Originally Posted by licont View Post
how much pressure should be on the low side and the high side?
With R134 it depends on the ambient air temperature.
Low side ranges from 25 psi at 65° to 55 psi at 90°
If you get a charging kit at an auto parts store, the guage is calibrated to show the proper low side pressure for the given air temperature.

You need a set of compound gauges to read high side pressure.
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Old 05-25-2013, 07:47 PM   #5
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i have the equipment already. I just need to know what the psi should be. right now ive got about 40 psi at 70 low side, and 200 psi high side. The high side is what concerns me. 200 seems really high to me.
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Old 05-25-2013, 10:20 PM   #6
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200 psi at 70° on the high side is not very high at all.
Actually could be a sign of a failing compressor.
What makes you think there's an issue with your A/C?
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Old 05-26-2013, 05:06 PM   #7
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there isnt. its brand new :P

I need to know how much to fill it on both sides haha
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Old 05-26-2013, 05:13 PM   #8
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Quote:
Originally Posted by licont View Post
there isnt. its brand new :P

I need to know how much to fill it on both sides haha
You only fill it on the low side, it's impossible to add to the high side
and could make the can explode if you even tried.
If you get the low side correct and it blows cold air the high side doesn't matter.
However, it can easily be well over 200 pai.
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Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
lift I .500 E .510 duration I 266 E 276
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Old 05-26-2013, 05:19 PM   #9
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yah. right now my low side is 40 psi at room temp (roughly 70 degrees) and 200 high side. blowing nice cold air.

So I guess all is well.
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Old 05-26-2013, 05:20 PM   #10
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Quote:
Originally Posted by licont View Post
yah. right now my low side is 40 psi at room temp (roughly 70 degrees) and 200 high side. blowing nice cold air.

So I guess all is well.
Yes, all is well.
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Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
lift I .500 E .510 duration I 266 E 276
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Old 05-26-2013, 05:25 PM   #11
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I had never worked on an AC system before. Was afraid the psi was too high and would explode.
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Old 05-26-2013, 05:27 PM   #12
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Quote:
Originally Posted by licont View Post
I had never worked on an AC system before. Was afraid the psi was too high and would explode.
It will get a lot higher than 200 psi on a 100° day.
R12 sytems use to run 300 psi or more.
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Original owner, 188k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
lift I .500 E .510 duration I 266 E 276
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