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What is your question?
air conditioner in back of van is blowing hot air
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Under the passenger side of the van about halfway back is a valve for the rear heat, it is vacuum controlled. Most likely the valve is stuck in the open position. The valve is relatively easy to replace, but not all rear air systems were supplied by general motors. Under the hood, passenger side there should be a label saying how much additional freon is required for the rear, the manufacturers name should be on this label, Pro air is one example.
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This was perfect. Thank you so much for the help.