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A borderline refrigerant charge will do just that. It will run nice and cold while cruising around but in low airflow across the condenser situations where the high side pressure rises , there isnt enough refrigerant to compensate and you get a dropout and bloop... warm ducts. Much more common than worn clutches. Compressors will usually give out before their clutches will wear enough to need adjustment
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-------Robert,:'00 XC70. '95 960, '93 940t, '90 240 wagon, '94 940SE, '84 240 diesel (she's sick) , '80 245 diesel, '86 740 GLE turbo diesel, '92 Ford F350 diesel dually
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