air condition

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we have an 2008 uplander,on idle the air doesnt get veery cool.about 75. on fast idle about 2500 it falls to about 60. we charged the sys. and the #s very . on idle low side is about 5o-55 and the high is about 175. at highway speed about 2500 rpm the low side at about 45 an high side about 205 any suggestions ????