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X3 E83 (2004 - 2010)
Talk about the E83 BMW X3 in this forum!

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Old 04-07-2015, 02:32 PM
realtordc realtordc is offline
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Location: Virginia
Join Date: Sep 2011
Posts: 60
Mein Auto: 2007 x3 3.0 si
How many psi for ac system pressure?

I just got a can of that bottled RFA-134a as my AC wasn't blowing cold. The gauge on it says 25 psi is the low-end borderline between low and charged and 45 is the upper threshhold between full and over-full.

I filled it to 30 psi to be on the safe side of not overfilling it and that got the AC blowing cold again, but I'd rather not be doing this 2 times a season so I'm wondering what is a safe pressure to fill it to?
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Old 04-08-2015, 05:52 AM
swampX3 swampX3 is offline
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Location: New Orleans
Join Date: May 2013
Posts: 1,139
Mein Auto: X3 and 330
AC pressure charts....images

the pressure can vary depending on such things as temp/humidity etc.....use a chart for 134a from here as a guide ......


also remember to add an ounce or two of oil when doing this job shade tree style
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Old 04-08-2015, 07:23 AM
Chdlrwnabmr Chdlrwnabmr is offline
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Location: Redmond, WA
Join Date: May 2005
Posts: 20
Mein Auto: 2006 X3
Don't trust the gauge on the can. It can vary enough that it will mess up your system. Unless you have a calibrated a/c gauge, what you want to do is measure the temperature of the air at the vent (with a/c on full). You should get 45-48F. Also, use your a/c once a month or two, even during winter, so that the seals do not dry out. If you do use the a/c often, and still have it blow warm, then you have a leak.
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Old 04-08-2015, 10:41 AM
jma1992 jma1992 is offline
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Location: Calgary, AB, Canada
Join Date: Aug 2013
Posts: 137
Mein Auto: 2005 X3 3.0i
This is one of those things that I would have done professionally.
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