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A/C recharge - need help with pressure psi
Posted by Derek in Durham [Email] (more from Derek in Durham) on Sat, 27 Mar 2004 13:25:40
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78 degrees here today so I decided to try to recharge the A/C. A/C output is cool but not as cold as I think it should be, nor was it last season. (I don't have a thermometer probe yet.)
I bought a $10 gauge and got 2 different pressure readings depending on whether the compressor was running or idle: 25-30 psi while idle, 40-45 psi while compressor was running.
Before that I let the A/C run 10 minutes. Engine was still running, A/C button was on the whole time, temp on max cool but fan speed 1 with no doors open (forgot about that until just now).
Past posts by Dean suggest 32-33 psi. How do I compare my readings? Do I need a $60 manifold pressure gauge? I don't know how to compare mine. I think the system might be low as it has not been recharged in the last 5 years, maybe longer (2nd owner).
Thanks, Derek / 1994 900 S V6 141,500mi
posted by 152.3.1...
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