Picked up a 96 Suburban for a deal i could not pass up . About a month ago i Got the AC Filled up with freon and the front was Ice cold but only heat coming out of the Rear . Last week I removed the Back panel and Changed all 3 Fuse relay's I guess that what they are called. I also shook the lines (very lightly)that go into the rear ac at the bottom . Did this like a week ago and still nothing so i just gave up . 2 Days ago i blasted both front and rear Ac and both were Ice COLD ...