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I am having a similar problem with a 96 850. The system has a full charge and seems to be holding it. After about 15 mins. the cold air becomes warm and may stay that way for some time before it switches back to cold. I don't understand how an evaporator can cause this type of problem. Someone posted a reply to me suggesting that the thermal switch in the compressor is bad. He said that it can not be repaired and compressor must be replace. Has anyone else had to do this. He said the switch is set for 74 degrees.
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