It could be the compressor clutch gap. You can force the clutch to engage using either VIDA or, IIRC, by bridging the connections on the connector to the pressure switch which should kick the compressor into life. If you get cold air then it's either pressure or the clutch gap most likely.
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Present: 2009 Volvo V50 1.6D DRIVe SE
Past: 2004 Volvo S40 T5 SE
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