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Assuming that the outside temp is around 108 deg f, you have the correct amount of refrigerant in there.
But it really looks like a clogged or stuck expansion valve. It takes very little to jam one of things things up. If you had compressor failure before and residue in the lines, chances are it's jamed up.
read this nice little gauge reading article, very handy : http://www.aircondition.com/tech/questions/82/Troubleshooting-with-Gauges-FAQ
I believe they have a nice section on flushing too.
If the thing has crud in it, the best course of action would be to get the volvo kit from fcpgroton, so you have a new high side hose, evaporator , drier and expansion valve, disconnect the rest of the componants,remove condensor run flush through and blow out with dry air .put an inlet screen ( little screen with oring that fits in the suction inlet )on the compressor inlet or a line filter ( have to cut high side line at metal section with tubing cutter and install with included compression fittings ) on the line to catch anything left so as not to jam anything else up or eat the compressor
also note, rarely, but it does hapen, an expansion valve is a little stuck out of the box. beforf resorting to surgery, with the thing running, give it a few VERY light taps with something that won't damage it and have high presure refrigerant blowing all over the place and see if it jiggles lose. if a little won't do it, alot won't either.
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-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually
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