What is the ac part located under the van behind the driver's door for rear ac.

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I know this is an old thread, but need the name of the part as it suffered road damage and is spewing coolant. Car is undrivable. Black rectangular box that is part of the rear ac system. Contacted 20 to 25 parts yards w/o success because I don't know the name of the part. Help! How long have you had this problem? 3 days